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Engineering (General) Consultants

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Herbert Joe, MA, MS, JD, LLM, BCFE, CFC, DABLEE, FACFE
Managing Partner
P.O. Box 702287
Dallas TX 75370
USA
phone: 800-650-TAPE (8273) / 214-505-TAPE (8273)
fax: 773-829-TAPE (8273)
Yonovitz-Joe-Forensic-Audio-Video-Experts-Logo.jpg
Yonovitz & Joe, LLP, a registered partnership based in Dallas, Texas, is a team of Forensic Audio / Video Analysts, experts, and consultants with over 64 combined years of experience. Their diverse legal, forensic, academic, research and clinical experience includes scientifically objective, verifiable and generally-accepted forensic analyses of audio and video evidence.

Services Include:
  • Forensic Audio / Video Authenticity
  • Forensic Voice / Speaker ID
  • Digital Audio or Video Enhancement
  • Text / Video Transcription & Verification
  • Copyright Infringement
  • Forensic Audiology
  • Linguistics
  • Phonetics
  • Acoustics
  • Noise / Sound Analysis
  • Electronic Signature Analysis
  • Alcohol, Drug or Stress Effects on Speech
  • Managing Partner, Herbert Joe, MA, MS, JD, LLM, BCFE, DABFE, DABLEE, FACFE, has five degrees, including three science degrees and two law degrees, and is a Board Certified Forensic Audio / Video Examiner. He has 29 years of experience providing Forensic Audio / Video consultation services.

    Mr. Joe has conducted research, authored peer-reviewed publications, and been interviewed and consulted with various news and entertainment entities domestically and internationally. High profile cases include the Branch Davidian case, State of Florida vs. George Zimmerman; the Associated Press (Osama bin Laden); consultations with Dr. Phil (Manti Teo), the WSJ, CSI:Miami, TMZ (Michael Jackson), and People Magazine (Mel Gibson).

    Speaking Engagements & Presentations - Mr. Joe is consistently invited to speak on topics within his expertise, including his analyses in the State of Florida vs. George Zimmerman, Digital Signal Processing in Forensic Acoustic Cases, and Legal Issues in the Forensic Analyses of Audio and Video Evidence.

    View Herbert Joe's Expert Witness Profile.
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    Ralph Wilhelm
    President & Founder
    16002 Colleton Ct.
    Carmel Indiana 46033
    USA
    phone: 317-508-6866
    fax: 317-571-0429
    Wilhelm Associates has over two hundred twenty cumulative years of experience in the Automotive Electronics Industry. As consultants, their strength is based on insightful analysis of potential sales opportunities and technical product gaps and differentiating opportunities. They focus on delivering an overarching strategy, supported with specific tactics that will enable success in the North American automotive electronics marketplace. Their experience is in Tier One and Tier Two markets and products covering services including:

    Strategic Analysis - Business Development and Analysis - Technical Reviews and Alternatives - Licensing and Teaming for Success - Market Research - Market and Technical Analysis - Lean Systems Development and Analysis

    President and Founder, Ralph V. Wilhelm, PhD, has over forty years of industry experience in the Automotive Industry. Dr. Wilhelm is familiar with automotive electronic component technology and the supply-line management required not only producing competitive automotive component and systems, but supervising the R&D, advanced engineering, forward technology development, sales, and product line management process from OEM to customer.

    Dr. Wilhelm and his team have served dozens of clients, ranging from privately owned to publicly traded firms, small thirty person companies to Fortune 500 sized firms, small to very large law firms, and companies headquartered in Germany, France, Canada, China, Taiwan, Korea, Japan, and the US.

    View Dr. Wilhelm's Expert Witness Profile.
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    Jeffery H. Warren, PhD, PE , CSP
    Chief Engineer & CEO
    Mail: PO Box 1608
    Visit: 7805 Saint Andrews Road
    Irmo SC 29063
    USA
    phone: 888- 827-7823 / 803-732-6600
    fax: 803-732-7576
    Jeffery-Warren-Mechanical-Engineering-Expert-Photo.jpg

    Jeffery H. Warren, PhD, PE, CSP is Chief Engineer and CEO of The Warren Group. A licensed professional engineer in 14 states, he holds a Bachelor of Science in Mechanical Engineering from the University of North Carolina as well as a Master of Science and a Doctorate in Mechanical Engineering from Virginia Polytechnic Institute and State University — all with machine design emphasis. 

    Background Experience - A former research engineer for DuPont at the Savannah River Laboratory, Dr. Warren designed, patented, and built an incinerator to burn radioactive waste. He also taught mathematics and engineering at the University of South Carolina in Aiken. Later, Dr. Warren was chief machine designer and owner of Warren Engineering Company, Inc., which designed and built special machinery for manufacturing automation. He combined his passion for keeping people safe with his knowledge of mechanical engineering, machine design, risk assessment, and safety to pursue a career in forensic engineering. 

    Dr. Warren is a Certified Safety Professional in engineering aspects and a Certified Fire and Explosion Investigator. He has investigated more than 2,000 claims involving property damage and injuries related to machinery, equipment, and products since 1987. Dr. Warren is a court-qualified expert in mechanical engineering, machine design, risk assessment, and safety. He’s also testified in several hundred depositions and more than 75 trials in state and federal court. He has successfully passed Daubert challenges. Dr. Warren was on the committee that authored the ANSI Technical Report, ANSI B11.TR3-2000 entitled, “Risk Assessment and Risk Reduction – A Guide to Estimate, Evaluate and Reduce Risks Associated with Machine Tools.” He regularly investigates personal injury and wrongful death product liability claims as well as property damage claims involving machinery and equipment in both manufacturing and construction workplaces for both the plaintiff and the defense. He has a reputation for thoroughly analyzing each case to provide precise, understandable, fact-based opinions. 

    Dr. Warren has a way of making complicated mechanical engineering, machine design, risk assessment and safety concepts understandable to the ordinary person. He also presents classes and seminars on topics ranging from investigation of machinery and equipment, unintentional injury claims, subrogation and SAFETYTHROUGHDESIGN®. 

    Areas of Expertise:

    • Machine Design and Safeguarding
    • Mechanical Engineering
    • Risk Assessment
    • Safety
    Welcome to the third and final post in our multipart series of blog posts about a young boy's fall and serious injury at a public playground. In our first post we gave a brief overview of the incident and our investigation. In the second post we discussed some of the safety standards applicable to public playgrounds. In this post, we will examine some of the impact-absorbing playground surfaces available to protect children at playgrounds from injury. If you would like to read the first two posts, they are available here and here.

    Welcome to the second part in our multipart blog series examining a young boy's fall and injury at a public playground. If you missed the first part in this series, click www.warrenforensics.com/2017/10/11/children-will-fall-at-playgrounds-what-shall-we-do-to-protect-them-a-multipart-blog-series-part-i/ to read it. In this post, we will highlight some resources that designers of public playgrounds can use to help ensure their designs are reasonably safe.

    In 2011, a 5-year old boy was severely injured at a public playground when he fell through a second floor opening around a fireman's pole in a playhouse. He fell more than seven feet and struck a bare concrete floor. We are thankful that he eventually recovered from his injuries. The person who designed and built the playground was accused of negligence. A lawsuit ensued, and eventually settled in favor of the boy.

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    Matthew Warren
    Main Contact
    Mail: PO Box 1608
    Visit: 7805 Saint Andrews Road
    Irmo SC 29063
    USA
    phone: 888- 827-7823 / 803-732-6600
    fax: 803-732-7576
    warren-forensics-logo.gif

    Warren Forensic Engineers and Consultants, founded in 1997, is extremely well versed in the disciplines of Mechanical, Electrical, Chemical, Structural, and Fire and Explosion investigation. Their engineers are known for delivering the truth — origin, cause, responsibility, and cost of an event or claim — with unmistakable clarity. Warren Forensics provides technical investigations and analyses of personal injury and property claims as well as expert testimony for insurance adjusters and attorneys. Each member of their engineering team is a licensed professional engineer (P.E.) in multiple states. Beyond engineering expertise, their engineers and consultants also hold a variety of other certifications including Certified Fire and Explosion Investigator, Certified Vehicle Fire Investigator, Certified Fire Investigation Instructor, CMSE®-Certified Machine Safety Expert, Certified Safety Professional, Certified Building Inspector, and Certified Property and Evidence Specialist. 

    Types of Loss:

    • Chemical: Ammonia - Confined Space - OSHA
    • Collision: Animal - ATV - Automotive - Bicycle - Farm Equipment - Motorcycle - Pedestrian - Truck
    • Commercial: Construction Defects - Construction Related Losses - Electrical and Control Systems - Liability Claims - Lightning Damage - Mechanical Systems - Roofing - Slip, Trip and Fall - Structural - Water Damage - Workplace Injuries
    • Fires and Explosions: Boiler - Commercial - CSST - Dust Explosions - Electrical - Fire Protection Systems - Industrial - LP and Natural Gas - Machinery and Equipment - Marine - Residential - Spontaneous Combustion - Structural - Vehicle and Mobile Equipment - Welding and Hot Work
    • Industrial: Boilers and Pressure Vessels - Construction Defects - Construction Related Losses - Cranes, Hoists, Lifting and Rigging - Electrical and Control Systems - Industrial Process Equipment - Liability Claims - Lightning Damage - Machinery and Equipment - Material Handling - Mechanical Systems - Roofing - Slip, Trip and Fall - Structural - Water Damage - Workplace Injuries
    • Inland and Ocean: Boilers and Pressure Vessels - Bulk Material Handling - Cargo Damage Assessment - Cargo Handling - Cranes, Hoists, Lifting and Rigging - Docks and Piers - Machinery and Equipment - Marinas - Marine Collisions - Marine Fire Protection Systems - Marine Liability Analysis - Mechanical and Electrical Systems - Slip, Trip and Fall - Workplace Injuries
    • Residential: Construction Defects - Construction Related Losses - Electrical Systems - Lightning Damage - Mechanical Systems - Roofing - Slip, Trip and Fall - Structural - Water Damage
    • Subrogation: Consumer Products - Electrical - Fire and Explosions - Machinery and Equipment - Workers’ Compensation
    • Catastrophic: Earthquake - Flood - Freeze, Ice and Snow - Hail Storm - Hurricane - Tornado - Wildfire - Wind Storm and Wind Shear

    Featured Experts:

    This is the first blog in a series on integrating new technologies into the process of forensic investigations. Documenting the scene of an incident accurately, efficiently, and safely is a key step in every investigation. Busy roadways and unstable structures present hazards to the investigator during the investigation process. The use of remote sensors can reduce these risks and provide data that otherwise could not safely be obtained.

    Welcome to the third and final post in our multipart series of blog posts about a young boy's fall and serious injury at a public playground. In our first post we gave a brief overview of the incident and our investigation. In the second post we discussed some of the safety standards applicable to public playgrounds. In this post, we will examine some of the impact-absorbing playground surfaces available to protect children at playgrounds from injury. If you would like to read the first two posts, they are available here and here.

    10/8/2018 · Chemical Industry
    On December 3, 1984, at a pesticide ingredient manufacturing facility owned by Union Carbide, a leak occurred in the Methyl Isocyanate (MIC) plant. Due to the toxic nature of the gases released and the plant's proximity to local residences, the death toll was in the thousands; both plant workers and nearby residents. The first recorded public meeting in response to this incident was on December 9th, in Institute, WV, the site of Union Carbide's only US MIC production unit. Full disclosure: my father was a research & development chemist for Union Carbide and Institute is about 10 miles down the Kanawha River from my hometown of Charleston, WV.

    Welcome to the second part in our multipart blog series examining a young boy's fall and injury at a public playground. If you missed the first part in this series, click www.warrenforensics.com/2017/10/11/children-will-fall-at-playgrounds-what-shall-we-do-to-protect-them-a-multipart-blog-series-part-i/ to read it. In this post, we will highlight some resources that designers of public playgrounds can use to help ensure their designs are reasonably safe.

    Many people just take for granted that something is just going to work, and in many cases assume that it will work forever. One such device that does not get enough attention is the Ground Fault Circuit Interrupter (GFCI). Simply put, a GFCI is a protective device that compares the current flowing on the hot and neutral wires of the circuit and will "trip" to disconnect power to the circuit if a small imbalance of current is detected. The imbalance of current is an indication of a dangerous alternate path for the current to flow from a damaged line cord or a fault inside an appliance and constitutes a shock hazard to a person.

    In 2011, a 5-year old boy was severely injured at a public playground when he fell through a second floor opening around a fireman's pole in a playhouse. He fell more than seven feet and struck a bare concrete floor. We are thankful that he eventually recovered from his injuries. The person who designed and built the playground was accused of negligence. A lawsuit ensued, and eventually settled in favor of the boy.

    Event Data Recorders (EDRs) were first introduced by General Motors (GM) in 1974. That data was only available to GM; however, since 1994 more and more vehicle EDR’s have recorded data that can be gathered. The data captured can be imaged and is being used by vehicle manufacturers, law enforcement officers, and collision reconstructionists to better understand what is happening in a collision. In accident investigation, EDRs have the potential to provide independent measurements of crash data that would elsewise be estimated by reconstruction methodology.

    6/27/2018 · Corrosion
    When thinking about the safe operation of boilers (and don't we all?), several systems can readily be named; flame control, fuel/air ratio; steam pressure control, levels in the vessel, etc. What about the water? It seems so passive, as long as there is enough for level control, what's the big deal? Well, it turns out, that as the steam produced by a boiler is used in the process, the condensate from that steam is returned to the boiler as feedwater. However, since 100% of the condensate is not returned, whatever solids had been in that water before it evaporated to form steam are left in the remaining water. Fresh feedwater is added to maintain levels, but even fresh water contains some dissolved solids. So over time, the water in the boiler system gets saturated with all sorts of dissolved minerals.

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    John Phillips, PE, CFEI
    Senior Consulting Engineer
    Mail: PO Box 1608
    Visit: 7805 Saint Andrews Road
    Irmo SC 29063
    USA
    phone: 888- 827-7823 / 803-732-6600
    fax: 803-732-7576
    John-Phillips-Crane-Heavy-Equipment-Expert-Photo.jpg

    John Phillips, PE, CFEI, Senior Consulting Engineer, has more than 30 years of Crane and Heavy Equipment experience and more than 20 years of experience in forensic engineering. In addition to holding a Bachelor of Science degree in Mechanical Engineering from the University of South Carolina, Mr. Phillips is a Licensed Professional Engineer in South Carolina, North Carolina, Georgia, Louisiana, Ohio and Minnesota. He is NCEES registered both as a model engineer and with The United States Council for International Engineering Practice. During his career, Mr. Phillips has designed crane systems, supervised installation, tested and certified lifting equipment even serving as a project engineer for maintenance and certification of nuclear weapon lifting and handling systems. His extensive experience helps him determine the cause and scope of damage for crane, hoist, and other lift equipment incidents. In addition, he’s a certified Fire and Explosion Investigator and a certified Fire Investigator Instructor by the National Association of Fire Investigators. 

    Mr. Phillips is adept at determining the origin, cause, and scope of damage for equipment and structural fires. He also evaluates consumer and industrial equipment for product defects, guarding, and safety issues. He has testified in depositions and trials in state and federal court. Mr. Phillips is a member of the International Code Council (ICC), American Society of Materials (ASM) and the American Society of Testing and Materials (ASTM), as well as a voting member of the ASTM Performance of Buildings, Forensic Sciences, Forensic Engineering, and Ships & Marine committees. 

    Areas of Expertise:

    • Cranes and Heavy Machinery
    • Hoist and Lifts
    • Crane / Heavy Equipment Failure Analysis
    • Fires and Explosions
    • Industrial Accident Reconstruction
    • Machinery Damage Assessment
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    Jennifer Morningstar, BSChE, PE, CFEI
    Chemical Engineer
    Mail: PO Box 1608
    Visit: 7805 Saint Andrews Road
    Irmo SC 29063
    USA
    phone: 888- 827-7823 / 803-732-6600
    fax: 803-732-7576
    Jennifer-Morningstar-Chemical-Release-Expert-Photo.jpg

    Jennifer Morningstar, PE, CFEI, is a licensed professional engineer in South Carolina, North Carolina, Georgia, Iowa and West Virginia, and an NCEES Model Law Engineer. Ms. Morningstar is a member of the National Association of Fire Investigators (NAFI) and the American Institute of Chemical Engineers (AIChE). She holds a Bachelor of Science Degree in Chemical Engineering from Virginia Polytechnic Institute and State University, as well as a Masters of Business Administration from the University of South Carolina. Background Experience - Ms. Morningstar has 19 years of industrial experience. She spent 16 years working at a polyethylene terephthalate (PET) manufacturer gaining familiarity with all the unit operations. Her experience includes distributed control systems (DCS) and programmable logic controllers (PLC). She is an OSHA-trained Process Hazard Analysis study leader and completed Root Cause Failure Analysis training to become an Incident Investigator. Ms. Morningstar authored Lockout / Tagout Procedures and Confined Space Entry Procedures. She also managed capital expansion projects in excess of $1M and then spent 3 years as an energy management consultant in a variety of industries including mineral extraction, pulp & paper, animal harvesting & packaging (including rendering) and grain milling. Ms. Morningstar worked with both natural gas and coal-fired boilers producing saturated steam and super-heated steam for cogeneration. Other processes in her expertise include air compressors, cooling towers, chillers, multi-stage ammonia-based refrigeration systems, waste water treatment and biogas production. Areas of Expertise:

    • Chemical Release and Exposure
    • Environmental Regulatory Compliance
    • OSHA Process Safety Management
    • Industrial Accident Investigation
    • Fires and Explosions
    • Confined Space Entry
    • Lockout / Tagout
    • Scope of Damage / Cost to Repair
    10/8/2018 · Chemical Industry
    On December 3, 1984, at a pesticide ingredient manufacturing facility owned by Union Carbide, a leak occurred in the Methyl Isocyanate (MIC) plant. Due to the toxic nature of the gases released and the plant's proximity to local residences, the death toll was in the thousands; both plant workers and nearby residents. The first recorded public meeting in response to this incident was on December 9th, in Institute, WV, the site of Union Carbide's only US MIC production unit. Full disclosure: my father was a research & development chemist for Union Carbide and Institute is about 10 miles down the Kanawha River from my hometown of Charleston, WV.

    6/27/2018 · Corrosion
    When thinking about the safe operation of boilers (and don't we all?), several systems can readily be named; flame control, fuel/air ratio; steam pressure control, levels in the vessel, etc. What about the water? It seems so passive, as long as there is enough for level control, what's the big deal? Well, it turns out, that as the steam produced by a boiler is used in the process, the condensate from that steam is returned to the boiler as feedwater. However, since 100% of the condensate is not returned, whatever solids had been in that water before it evaporated to form steam are left in the remaining water. Fresh feedwater is added to maintain levels, but even fresh water contains some dissolved solids. So over time, the water in the boiler system gets saturated with all sorts of dissolved minerals.

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    Thomas J. Kelly, MSEE, MBA, PE, CFEI
    Senior Consulting Engineer
    Mail: PO Box 1608
    Visit: 7805 Saint Andrews Road
    Irmo SC 29063
    USA
    phone: 888- 827-7823 / 803-732-6600
    fax: 803-732-7576
    Tom-Kelly-Electrical-Engineering-Expert-Photo.jpg
    Thomas J. Kelly, MSEE, MBA, PE, CFEI, Senior Consulting Engineer, is a licensed professional engineer in South Carolina, North Carolina, Alabama, Georgia, Florida, and Maryland, and an NCEES Model Law Engineer. He has both a Bachelor of Science in Electrical Engineering and a Master of Science in Electrical Engineering from Florida Atlantic University, Boca Raton, Florida, along with a Master of Business Administration, with an emphasis in strategic leadership, from Winthrop University, Rock Hill, South Carolina.

    Mr. Kelly's 25-year career in electrical engineering includes forensic engineering investigation involving industrial electrical accidents, electrical equipment failure analysis, control system failures, including robotics and automation components and scope of damage assessments. He has conducted investigations for arc flash incidents, electrocution and electric shock accidents and lightning strike evaluations. From his large facilities management, Mr. Kelly has a depth of knowledge in building envelope performance, lighting system performance and compliance, low and medium voltage electrical distribution systems, and automated production control systems. Critical data infrastructure systems are a special area of interest including emergency and standby power systems.

    Mr. Kelly's experience also includes the design and analysis of Alternative Energy Systems utilizing both solar and fuel cell technologies. A Certified Fire and Explosion Investigator, Tom is experienced in fire and explosion analysis, origin, and cause investigations. Drawing from prior product design work, he has a wide range of experiences with product defect analysis and evaluating the workmanship of installed electrical systems.

    Areas of Expertise:
    • Electrical Equipment Failures
    • Electrocution and Electric Shock Accidents
    • Fires and Explosions
  • Industrial Electrical Accidents
  • Lightning Strike Analysis
  • Scope of Damage - Estimate of Repair
  • This is the first blog in a series on integrating new technologies into the process of forensic investigations. Documenting the scene of an incident accurately, efficiently, and safely is a key step in every investigation. Busy roadways and unstable structures present hazards to the investigator during the investigation process. The use of remote sensors can reduce these risks and provide data that otherwise could not safely be obtained.

    Many people just take for granted that something is just going to work, and in many cases assume that it will work forever. One such device that does not get enough attention is the Ground Fault Circuit Interrupter (GFCI). Simply put, a GFCI is a protective device that compares the current flowing on the hot and neutral wires of the circuit and will "trip" to disconnect power to the circuit if a small imbalance of current is detected. The imbalance of current is an indication of a dangerous alternate path for the current to flow from a damaged line cord or a fault inside an appliance and constitutes a shock hazard to a person.

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    John Holecek, MSME, PE, CSE, CFEI
    Senior Consulting Engineer
    Mail: PO Box 1608
    Visit: 7805 Saint Andrews Road
    Irmo SC 29063
    USA
    phone: 888- 827-7823 / 803-732-6600
    fax: 803-732-7576
    John-Holecek-Industrial-Product-Design-Expert-Photo.jpg

    John Holecek, MSME, PE, CSE, CFEI, Senior Consulting Engineer, is a licensed professional engineer in 8 states and has both a Bachelor of Science in Mechanical Engineering and Master of Science in Mechanical Engineering from the University of South Carolina. Mr. Holecek has passed the professional engineering exam in both Mechanical and Controls Engineering. A NAFI Certified Fire and Explosion Investigator, he has more than 22 years of experience in the design of industrial, commercial and consumer products. These products include industrial ovens, paint spray systems, HVAC systems, conveyors, and gas appliances including commercial cooking equipment and gas grills. Mr. Holecek's design experience includes the control systems for these products as well as the normal safeguarding provisions applied to these products. Additionally, he has supervised manufacturing operations and managed outside contractors in site safety requirements and the installation of industrial process equipment. By virtue of his experience, he is well versed in federal and state worker safety regulations. 

    Areas of Expertise:

    • Electrical and Mechanical Control Systems
    • Fires and Explosions
    • Gas Fired Equipment and Appliances
    • ICC, NFPA, OSHA Codes and Standards
    • Industrial Processes and Operations
    • Safety Regulations
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    Aaron (Al) L. Duncan II, ACTAR
    Vehicle Collision Reconstructionist
    Mail: PO Box 1608
    Visit: 7805 Saint Andrews Road
    Irmo SC 29063
    USA
    phone: 888- 827-7823 / 803-732-6600
    fax: 803-732-7576
    Aaron-Duncan-Collision-Reconstruction-Expert-Photo.jpg

    Aaron (Al) Duncan II, ACTAR, is a Vehicle Collision Reconstructionist with Warren. He is accredited as a Traffic Accident Reconstructionist by The Accreditation Commission for Traffic Accident Reconstruction. 

    Background Experience - Prior to joining Warren, Mr. Duncan worked for 23 years as a South Carolina Highway Patrol Trooper to include 10 years as a Multi-Disciplinary Accident Investigation Team (M.A.I.T.) member. As a trooper, he investigated in excess of 1,000 vehicle accidents and incidents. Then, as a member of M.A.I.T. for 10 years, he was involved in over 1,000 detailed investigations and collision reconstructions. Mr. Duncan is a member of the South Carolina Association of Reconstruction Specialists (SCARS), the International Association of Accident Reconstruction Specialists (IAARS), and the Blue Knights International Motorcycle Group. He holds a Bachelor of Science Degree in Political Science from Lander University in Greenwood, South Carolina and completed the Law Enforcement Basic Program at the South Carolina Criminal Justice Academy in Columbia, South Carolina. 

    Mr. Duncan has testified multiple times in state courts and he has been court qualified as an expert in accident investigation and collision reconstruction. His expertise focuses on investigating and reconstructing vehicle collisions involving single and multi-vehicles, animals, pedestrians, motorcycles, heavy trucks, and commercial vehicles. Mr. Duncan is also a skilled user of Forensic Mapping Technology and Computerized Collision Diagramming Software for collision scene analysis. He is experienced in the data download and analysis of airbag black boxes (Crash Data Retrieval Units) in automobiles, pickup trucks, and SUVs. 

    Areas of Expertise:

    • Crash Data Retrieval
    • Forensic Mapping Technology
    • Vehicle Collision Reconstruction
    Event Data Recorders (EDRs) were first introduced by General Motors (GM) in 1974. That data was only available to GM; however, since 1994 more and more vehicle EDR’s have recorded data that can be gathered. The data captured can be imaged and is being used by vehicle manufacturers, law enforcement officers, and collision reconstructionists to better understand what is happening in a collision. In accident investigation, EDRs have the potential to provide independent measurements of crash data that would elsewise be estimated by reconstruction methodology.

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    Roger Davis, PE, CFEI
    Senior Consulting Engineer
    Mail: PO Box 1608
    Visit: 7805 Saint Andrews Road
    Irmo SC 29063
    USA
    phone: 888- 827-7823 / 803-732-6600
    fax: 803-732-7576
    Roger-Davis-Mechanical-Engineering-Expert-Photo.jpg
    Roger Davis, PE, CFEI, Senior Consulting Engineer, is a Licensed Professional Engineer in South Carolina, North Carolina, Alabama, Georgia, and Mississippi. Mr. Davis holds a Bachelor of Science in Mechanical Engineering and a Master of Business Administration from the University of South Carolina. He also has a certificate in Crane Safety from the Georgia Institute of Technology, Distance Learning and Professional Education Center as well as certificates in Fire and Explosion Investigation and Vehicle Fire Investigation.

    Mr. Davis is experienced with municipal water, sanitary sewer, and storm water system design, construction, and operations. His expertise also includes property damage and personal injury investigations involving municipal utilities. Mr. Davis is an accomplished gas and diesel engine mechanic and has more than 30 years of experience with hydraulic plumbing and piping issues. He gained practical experience in hydraulics, fluid flow, tanks, and material handling with the South Carolina Department of Health and Environmental Control (DHEC) and Laidlaw Environmental Services, Inc., the largest hazardous and industrial waste firm in North America. He also gained experience in industrial operations as a Manufacturing Engineer.

    Roger Davis has investigated claims and injuries ranging from pressure piping system failures and material and personnel handling equipment to large engine failures and fires involving machinery, generators and vehicles.

    Areas of Expertise:
    • Aerial Lifts
    • Failure Analysis
    • Industrial and Accident Reconstruction
  • Machine Safeguarding
  • Products Liability Vehicle
  • Mechanical Failure
  • Water and Sewer Systems
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    James D. Wamble, PE, RLS
    PE, RLS
    40 Middleton Street
    Nashville TN 37210
    USA
    phone: 615-251-9555
    fax: 615-251-9034
    James-Wamble-Associates-logo.gif
    James D. Wamble, PE, RLS has over 30 years of experience as a Professional Civil Engineer and Registered Land Surveyor. During the course of his career, Mr. Wamble has worked on land planning, land surveying, or civil engineering projects in all counties of the middle and west Tennessee regions, and several counties in east Tennessee.

    Selected Recent Projects:
    • Lake Forest Estates – Approximately 5000 residential units and numerous commercial parcels. Largest subdivision in the state. Provided land planning, land surveying, and civil engineering services
    • Reelfoot Lake – Boundary survey of an 18,000-acre public lake to determine the pre-1917 Ordinary Low Water Mark for a Federal lawsuit in Lake County and Obion County, TN. Performed land surveying and expert witness services
    • Tapestry – 393 unit condominium and apartment development with 6,000 sq. ft. of commercial space in a Traditional Design Town Center in Brentwood, Williamson County, TN. Provided land planning, land surveying, and civil engineering services
    • Evans Hill - 340 mixed residential units designed as a Traditional Specific Plan in Hermitage, Davidson County, TN. Provided land planning, land surveying, and civil engineering services
    • Evergreen Hills - 900 mixed residential units designed as a Traditional Specific Plan in the Cane Ridge Community of Nashville, Davidson County, TN. Provided land planning, land surveying, and civil engineering services
    Services Include:
  • Civil Engineering
  • Land Use Planning
  • Land Surveying
  • Retail, Res., Industrial, Comm. Site Design
  • Construction, Grading, Drainage Plans
  • Roadway, Detention, Basin Design
  • Erosion Control
  • Water Quality Design
  • Engineering Studies
  • Cost Estimates / Financial Analysis
  • Developability / Constructability Analysis
  • Feasibility Studies
  • Residential, Industrial, Commercial, Mixed-Use
  • Zone Change Request
  • Planned Unit Development Design
  • Specific Plan Design
  • Natural Resource Analysis
  • Graphic Presentation
  • Site Selection Consultation
  • Boundary
  • Topography
  • As-Built
  • Route
  • ALTA Land Title
  • Utility
  • Aerial Ground Control
  • Construction
  • GPS


  • View James Wamble's Expert Witness Profile.
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    44648 Mound Rd.
    Suite 174
    Sterling Heights MI 48314
    USA
    phone: 248-408-7981
    Douglas-Van-Sweden-Vehicle-Accident-Reconstruction-Expert-Photo.jpg
    Douglas J. Van Sweden, PE, is a Mechanical Engineer with over 45 years of experience in the automobile industry, including 20 years with the General Motors Corporation.

    Litigation Support - Since 1997, Mr. Van Sweden has been providing insurance companies, legal firms, and manufacturers with the objective, scientific research to clearly define what really happened, for the cost-effective answer. The facilities, equipment, training, and commitment to continuing education allow him to find and assemble the critical missing pieces in Accident Reconstruction cases. He painstakingly reconstructs events so the end picture will be the accurate and defensible answer to what really happened.

    Mr. Van Sweden's services are available to attorneys representing plaintiff and defendant and include site review, record review, thorough reports, depositions, and trial testimony as needed.

    Vehicle Expertise:
    • Cars
    • Trucks
    • Motorcycles
    • Boats
  • Recreational Vehicles
  • Bicycles
  • Personal Watercraft
  • Non-Transportation - Elevators, Hoists:
    • Vehicle Systems and Structures
    • Vehicle Design
    • Seat Belt and Airbag Restraint Systems
    • Interior Components
    • Fuel Systems
    • Electrical Systems
    • Cooling Systems
    • Exhaust Systems
  • Drive Trains
  • Brakes
  • Suspensions
  • Steering
  • Body
  • Corrosion
  • Crash Testing
  • Fires and Explosion Cause / Origin
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    Catherine Witt
    Traffic Safety Consultant
    PO Box 25436
    Kansas City Missouri 64119
    USA
    phone: 816-813-6232
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    Traffic Safety Consultants (TSC) specializes in Traffic Jurisdictional Requirements and Compliance. TSC provides consulting services in the following areas:
    • Incidents of Internal “Back-Overs” / “Trapped Betweens”
    • Special Events
    • Safety & Health Management
    • On-Site Safety Management
    • Construction Site inspections, Contractor Safety
    • Plan Review
  • Safety Audits
  • Internal Traffic Control Plans
  • Safety Policy for Roadway Workers
  • OSHA Compliance
  • Training for Employees and Management
  • Accident / Incident Investigation
  • Catherine Witt Traffic Safety Expert PhotoPrincipal, Catherine Witt, specializes in Temporary Traffic Patterns during construction operations, maintenance operations, utility operations, and special events. Any time the motorist traffic pattern is changed there are specific requirements. Ms. Witt and her team are familiar with the requirements on a national level, in all 50 states, the state specific requirements and job site specific based on contracts.

    Ms. Witt and her team have a total over 100 years experience in the Traffic Safety Industry. She has trained over 20,000 construction, maintenance, utility and law enforcement workers in the requirements nation wide and started out doing installation over 25 years ago.

    As a Master instructor contracted to the American Traffic Safety Services Association (ATSSA) for over 15 years, she has hands-on experience with varying requirements nationwide.

    View Catherine Witt's Expert Witness Profile.
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    Time-Variable Systems, LLC
    Jamie Chapman
    Principal
    500 Throckmorton St
    MS 2101
    Fort Worth TX 76102-3808
    United States
    phone: 6175138429
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    Jamie Chapman, PhD, has over 35 years of broad technical, engineering, operational, and economic expertise in the areas of Renewable Energy and Power Conversion Systems. Principal at Time-Variable Systems, LLC, Dr. Chapman provides strategic, technical, and engineering consulting services to law firms, technology-driven companies, federal laboratories and agencies. Recent clients have included law firms, Exro Technologies, the National Renewable Energy Laboratory, and technology-intensive product development companies in the United States and internationally.

    Consulting Specialties Include:
    • Innovative Electric Machines
    • Variable Speed Electric Generators
    • Marine Hydrokinetic Power Conversion Systems
    • Radar Sensing
    • Megawatt-scale Power Processing and Control via Power Electronics
    • Wind Turbines
    • Energy Storage
    • Rotary and Linear Electric Machines
    • Electronic Power Conversion
    • Control and Grid Interface
    Dr. Chapman's career and activities have spanned the industrial, academic, governmental, and legal arenas in the US, Europe, and Asia. He has been heavily involved with clients in program definition and funding together with the associated development of technology-intensive, multi-disciplinary product systems.

    Dr. Chapman's experience includes research and development focused on the technologies needed to maintain leadership for the next, next generation of multi-megawatt wind turbine power plants, including turbulence detection by lidar and radar. His work in this area generated four patent disclosures.

    From 2004-2010, Dr. Chapman served as Associate Director of the Wind Science and Engineering Research Center at Texas Tech University. As part of the Senior Research Faculty, he was a principal in achieving $10 million in external funding to implement a wind energy research and education program. Dr. Chapman delivered a graduate-level course on wind turbine design, control, grid interface and economics and initiated Texas Tech's program on the integration of wind turbines with desalination systems.

    View Dr. Chapman's Expert Witness Profile.
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    Bhuvan Urgaonkar, PhD
    Available Nationally and Internationally
    W371 Westgate Building
    University Park PA 16802
    USA
    phone: 814-933-7211
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    Bhuvan Urgaonkar, PhD, has over 15 years of experience in the field of Software Engineering and Computers. His work includes research in computer systems software, distributed computing (including systems such as Zookeeper, Redis, Memcached, Cassandra, Kafka), datacenters, cloud computing, storage systems, energy efficiency of computers and datacenters, big data (including systems such as Hadoop, Spark). 

    Dr. Urgaonkar has published over 80 research papers in competitive peer-reviewed conferences and journals on these topics with several best paper awards. He has procured research funding totaling more than $3 Million USD from federal agencies and industrial labs (Google, HP, IBM, Cisco, Microsoft, Amazon) to lead and train several Phd and MS students who now work in industry and academia. Dr. Urgaonkar has also delivered lectures on topics including Cloud Computing and Data Centers to Faculty at Microsoft and numerous other technology companies and universities around the world. 

    Education / Training: Ph.D. in Computer Science from the University of Massachusetts Amherst (2005) B.Tech (honors) in Computer Science and Engineering from the Indian Institute of Technology, Kharagpur, India 

    Awards / Honors: Test of Time Award, ACM Sigmetrics 2016 National Science Foundation Career award, 2010 IBM Faculty Fellowships, 2016, 2014 Several best paper awards (see CV) 

    Litigation Support - Dr. Urgaonkar serves as an expert / technical consultant with multiple firms helping them (i) understand technical content related to state of the art products in areas such as content distribution, distributed computing, datacenter design, among others and (ii) interpret patents in these areas and connections between them and state of the art products and services. Services are available to law firms, government agencies, schools, firms / corporations, and hospitals. They include case review, deposition, and trial testimony as needed. 

    Areas of Expertise:

    • Software Design and Analysis
    • Computer Systems
    • Operating Systems
    • File Systems
    • Databases
    • Computer Security
    • Performance
    • Distributed Computing
    • Data Centers
    • Cloud Computing
    • Big Data Systems
    • Web
    • Internet
    • Content Distribution Networks
    • Software Reliability and Testing
    • Fault Tolerance
    • Hadoop
    • Spark
    • Kubernetes
    • Linux
    • AWS
    • Azure
    • Machine Learning
    • Scheduling
    11/5/2018 · Computers
    Discovering end-to-end request-processing paths is crucial in many modern IT environments for reasons varying from debugging and bottleneck analysis to billing and auditing. Existing solutions for this problem fall into two broad categories: statistical inference and intrusive instrumentation. The statistical approaches infer request-processing paths in a "most likely" way and their accuracy degrades as the workload increases. The instrumentation approaches can be accurate, but they are system dependent as they require knowledge (and often source code) of the application as well as time and effort from skilled programmers.

    10/10/2018 · Computers
    Dynamic capacity provisioning is a useful technique for handling the multi-time-scale variations seen in Internet workloads. In this article, we propose a novel dynamic provisioning technique for multi-tier Internet applications that employs (1) a flexible queuing model to determine how much of the resources to allocate to each tier of the application, and (2) a combination of predictive and reactive methods that determine when to provision these resources, both at large and small time scales. We propose a novel data center architecture based on virtual machine monitors to reduce provisioning overheads. Our experiments on a forty-machine Xen/Linux-based hosting platform demonstrate the responsiveness of our technique in handling dynamic workloads. In one scenario where a flash crowd caused the workload of a three-tier application to double, our technique was able to double the application capacity within five minutes, thus maintaining responsetime targets. Our technique also reduced the overhead of switching servers across applications from several minutes to less than a second, while meeting the performance targets of residual sessions.

    9/20/2018 · Computers
    Since many Internet applications employ a multi-tier architecture, in this paper, we focus on the problem of analytically modeling the behavior of such applications. We present a model based on a network of queues, where the queues represent different tiers of the application. Our model is sufficiently general to capture (i) the behavior of tiers with significantly different performance characteristics and (ii) application idiosyncrasies such as session-based workloads, concurrency limits, and caching at intermediate tiers. We validate our model using real multi-tier applications running on a Linux server cluster. Our experiments indicate that our model faithfully captures the performance of these applications for a number of workloads and configurations. For a variety of scenarios, including those with caching at one of the application tiers, the average response times predicted by our model were within the 95% confidence intervals of the observed average response times. Our experiments also demonstrate the utility of the model for dynamic capacity provisioning, performance prediction, bottleneck identification, and session policing. In one scenario, where the request arrival rate increased from less than 1500 to nearly 4200 requests/min, a dynamic provisioning technique employing our model was able to maintain response time targets by increasing the capacity of two of the application tiers by factors of 2 and 3.5, respectively.

    8/31/2018 · Computers
    With public cloud providers poised to become indispensable utility providers, neutrality-related mandates will likely emerge to ensure a level playing field among their customers ("tenants"). We analogize with net neutrality to discuss: (i) what form cloud neutrality might take, (ii) what lessons might the net neutrality debate have to offer, and (iii) in what ways cloud neutrality would be different from (and even more difficult than) net neutrality. We use idealized thought experiments and simple workload case studies to illustrate our points and conclude with a discussion of challenges and future directions. Our paper points to a rich and important area for future work.

    8/13/2018 · Computers
    Modern Internet-scale distributed networks have hundreds of thousands of servers deployed in hundreds of locations and networks around the world. Canonical examples of such networks are content delivery networks (called CDNs) that we study in this paper. The operating expenses of large distributed networks are increasingly driven by the cost of supplying power to their servers. Typically, CDNs procure power through long-term contracts from co-location providers and pay on the basis of the power (KWs) provisioned for them, rather than on the basis of the energy (KWHs) actually consumed. We propose the use of batteries to reduce both the required power supply and the incurred power cost of a CDN.

    7/20/2018 · Computers
    Recent technological advances in the development of flashmemory based devices have consolidated their leadership position as the preferred storage media in the embedded systems market and opened new vistas for deployment in enterprise-scale storage systems. Unlike hard disks, flash devices are free from any mechanical moving parts, have no seek or rotational delays and consume lower power. However, the internal idiosyncrasies of flash technology make its performance highly dependent on workload characteristics. The poor performance of random writes has been a cause of major concern which needs to be addressed to better utilize the potential of flash in enterprise-scale environments. We examine one of the important causes of this poor performance: the design of the Flash Translation Layer (FTL) which performs the virtual-to-physical address translations and hides the erase-before-write characteristics of flash. We propose a complete paradigm shift in the design of the core FTL engine from the existing techniques with our Demand-based Flash Translation Layer (DFTL) which selectively caches page-level address mappings. We develop a flash simulation framework called FlashSim. Our experimental evaluation with realistic enterprise-scale workloads endorses the utility of DFTL in enterprise-scale storage systems by demonstrating: (i) improved performance, (ii) reduced garbage collection overhead and (iii) better overload behavior compared to state-of-the-art FTL schemes. For example, a predominantly random-write dominant I/O trace from an OLTP application running at a large financial institution shows a 78% improvement in average response time (due to a 3-fold reduction in operations of the garbage collector), compared to a state-of-the-art FTL scheme. Even for the well-known read-dominant TPC-H benchmark, for which DFTL introduces additional overheads, we improve system response time by 56%.

    6/27/2018 · Computers
    Cloud-based hosting promises cost advantages over conventional in-house (on-premise) application deployment. One important question when considering a move to the cloud is whether it makes sense for 'my' application to migrate to the cloud. This question is challenging to answer due to following reasons. Although many potential benefits of migrating to the cloud can be enumerated, some benefits may not apply to 'my' application. Also, there can be multiple ways in which an application might make use of the facilities offered by cloud providers. Answering these questions requires an in-depth understanding of the cost implications of all the possible choices specific to 'my' circumstances. In this study we identify an initial set of key factors affecting the costs of a deployement choice. Using benchmarks representing two different applications (TPC-W and TPC-E) we investigate the evolution of costs for different deployment choices. We show that application characteristics such as workload intensity, growth rate, storage capacity and software licensing costs produce complex combined effect on overall costs. We also discuss issues regarding workload variance and horizontal partitioning.

    6/7/2018 · Computers
    In this paper, we present techniques for provisioning CPU and network resources in shared hosting platforms running potentially antagonistic third-party applications. The primary contribution of our work is to demonstrate the feasibility and benefits of overbooking resources in shared platforms, to maximize the platform yield: the revenue generated by the available resources. We do this by first deriving an accurate estimate of application resource needs by profiling applications on dedicated nodes, and then using these profiles to guide the placement of application components onto shared nodes. By overbooking cluster resources in a controlled fashion, our platform can provide performance guarantees to applications even when overbooked, and combine these techniques with commonly used QoS resource allocation mechanisms to provide application isolation and performance guarantees at run-time.

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