Biomechanics Consultants: 8

Kristopher J. Seluga, PE, is a Mechanical Engineering, Accident Reconstruction, Biomechanics, and Safety Expert with over 20 years of experience. He received his Bachelor’s and Master’s degrees from the Mechanical Engineering department at MIT where he worked on the development of novel three-dimensional printing technologies.

Mr. Seluga is also a licensed Professional Engineer in New York and Connecticut, and has served as a member of the ANSI engineering committee for the Z130.1 and Z135 standards for golf cars and PTV’s. His research interests and peer reviewed publications span the topics of Motor Vehicle Dynamics, Product Safety, and Biomechanics.

Litigation Support - Mr. Seluga has been working as a forensic engineer at Technology Associates since 2001. He has investigated 100s of accidents for both plaintiffs and defendants. Mr. Seluga has been qualified to testify as an expert in state and federal court and is experienced in testifying in depositions and trials. He has successfully defeated Daubert / Frye challenges and can prepare and explain compelling exhibits at trial.

Areas of Expertise:

Dr. J.P. Purswell, PhD, PE, CPE has extensive experience in Human Factors, Ergonomics and Safety Engineering. He has completed projects for clients in all these areas and regularly teaches ergonomics and safety engineering at Colorado State University. 

Dr. Purswell Consults with Manufacturers on Product Safety Issues, including Warnings and Instructions. He also Consults with Employers regarding the development and implementation of safe and ergonomically sound work practices, including the identification and control of ergonomic risk factors for back injuries and upper extremity cumulative trauma disorders. 

Dr. Purswell has prepared ANSI Z535 compliant instructions and warnings for attic ventilators, deer-stands, LPG hoses, ammonia hoses, warehouse rack systems, and arts and craft products among others. He has also prepared ANSI Z129.1 compliant warnings for a range of chemical products from gasoline pump warnings to brake pads and ammonia hoses, and OSHA and ANSI Z400.1 compliant material safety data sheets for several chemical manufacturers. 

He is the author of more than 20 publications or presentations on product safety, occupational safety, printed warnings, and auditory warnings. He has been inducted into Alpha Pi Mu, the Industrial Engineering Honor Society and is a recipient of the Gordon Fellowship from the University of Oklahoma. 

Consulting Services:

• Design and Testing of Instruction Manuals and on Product Warnings
• Usability Testing of Products for Ease-of-Use and Safety
• OSHA Audits for Employers
• Employer Training - Benchmarking Safety Performance Against a Company's Industry
• Employer Training - How to Prepare For OSHA Inspections

View Dr. Purswell's Expert Witness Profile.

Page Engineering Inc., established in 1994, is an Ergonomics and Industrial Engineering consulting firm. They have provided services to clients throughout the United States and Canada. Their hands-on approach is backed by the extensive application of ergonomics, human factors, epidemiologic, and occupational medical scientific literature. Page Engineering experience includes conducting ergonomics analyses and research in the railroad industry, primarily, and in heavy industry, in general, for over 22 years. Their clients include Union Pacific Railroad, Kansas City Southern Railways, Association of American Railroads, Fedex, American Petroleum Institute, Food Marketing Institute, Food Distributors International, Blue Water Bridge Authority, and USPS.

Consulting Services - Page Engineering provides ergonomics services, integrating multiple disciplines (industrial engineering, safety, health, business, regulatory) to provide effective results, whether in the application of job analyses and job improvement processes or in physical job demands analyses. Their services include:

• Ergonomics Exposure Analysis and Workplace Improvements
• Ergonomics Design
• Organizational Risk Analysis
• Health and Safety Information Systems Development
• Expert Witness Services

George B. Page, CPE, is a Certified Professional Ergonomist. Since founding Page Engineering, Mr. Page has been providing ergonomics services, integrating multiple disciplines (industrial engineering, safety, health, business, regulatory) to provide effective results, whether in the application of job analyses and job improvement processes or in physical job demands analyses. His experience includes conducting ergonomics analyses and research in the railroad industry and in heavy industry for over 30 years. Mr. Page's expertise includes job exposure assessments, physical demands assessments, accident reconstruction, and forensic engineering.

Greg G. Weames, CPE, CCPE, CRSP, has been a practicing Ergonomist since 1994, after obtaining his B.Sc. and M.Sc. in kinesiology. Mr. Weames has spent several years as a corporate ergonomist for large organizations as well as has worked for several years in consulting. Currently, with Page Engineering, Inc., he has provided expert witness services, consulting services for various facilities projects, workplace, equipment, machine and tool analysis services, and job exposure analysis services. Over his years as an ergonomist, Mr. Weames has co-authored scientific publications, served on Federal, Industry, and Corporate level committees, developed and authored corporate programs and training, and has worked extensively across all departments of organizations, levels of management and employees.

Stephen D. Fleming, CPE, CXLT, is an Industrial Engineer / Ergonomist whose background includes analyzing work environments and work tasks using industrial engineering work measurement methods and risk assessment models for different body regions. His expertise is in assisting industrial clients in applying ergonomics to workplace processes, tools, and equipment, including all major North American railroads, FedEx, Ford Motor Company, Lear Seating, USPS, and the Blue Water Bridge Authority. Mr. Fleming has been acknowledged for developing and implementing a methodology for measuring and analyzing exposure to whole-body vibration (WBV) and hand-arm vibration (HAV).

View Page Engineering's Expert Witness Profile.

Mechanical Solutions, Inc. (MSI) provides new equipment design, computer-aided analysis, installed equipment field testing and problem solutions. MSI staff performs these tasks for all types of Pumps, Compressors, Fans, Turbines, and Motors. For pumps and compressors, expertise includes both centrifugal and positive displacement (e.g. reciprocating or screw) configurations.  Turbine knowledge and experience include hydraulic turbine generators (“hydroturbines”) as well as aircraft gas turbine engines and land-based gas or steam turbine power generation systems. Applications include green energy, power, process, petrochemical, paper, and water resource industries.

MSI uses advanced finite element analysis (FEA), rotordynamics, and torsional analysis tools, and uses computational fluid dynamics (CFD) to analyze 3-D steady or unsteady fluid flows and heat transfer, enabled by its 230 high speed processor supercomputer. MSI also uses top-of-the-line testing equipment, including multichannel FFT analyzers (up to 200 simultaneous channels) to accurately read the outputs of various vibration, stress/strain, and pressure sensors, as a function of both time and frequency. As a unique additional test capability, MSI uses motion magnification video cameras to amplify and display scene vibration by 1000x. MSI uses calibrated exciters while equipment remains running, to locate structural, rotor, and acoustic natural frequency resonances as they exist at any particular operating point, without interfering with machinery operation.  In addition, MSI performs stress, acoustic, dynamic pressure pulsation, electric current spectrum, and aero/hydraulic performance testing. 

MSI also has been project team leader in the development of advanced rocket turbopumps, as well as turbopump diagnostics, for the U.S. Air Force and NASA Marshall Space Flight Center. MSI is funded for several large projects with the U.S. Navy and Air Force involving vision-based systems that automatically evaluate and display/amplify machinery or system dynamic events.  As a result of these projects, MSI has developed its VibVue® vibration motion magnification system, which can magnify vibration 1000x in the full field-of-view of the equipment.  This system is available as a service, or for purchase.

Mechanical Solutions has a staff of approximately 30 technical professionals, many of whom are well known internationally in the area of pumps, compressors, and turbines.  For example, MSI’s Dr. Edward Bennett won the ASME Gopalakrishnan award for best pump fluids technologist, and was later awarded another ASME medal for CFD.    MSI’s Paul Boyadjis has won the Hydraulic Institute 2021 Standards Partner of the Year award. Since its founding in 1996, MSI has strived to provide best-in-class service throughout the world.

William D. Marscher has over 50 years of experience in the field of Fluid Systems and their rotating and reciprocating machinery, particularly large turbines, generators, compressors, and pumps.  His typical work responsibilities include design, analysis, and testing of all types of plant machinery, as well as other types of fluid and mechanical systems.   

Mr. Marscher received a B.S.M.E. from Cornell University in 1970, and a Master Eng. (Mech. Des.) in 1972, when he was a NASA Fellow and the lead graduate student for the original Mars Rover Design project.  In 1976, he received an M.Sc. in Engineering Physics from Rensselaer Polytechnic Institute. He is a registered and licensed Professional Engineer, State of New Jersey Lic. No. 40626.

For 25 years, Mr. Marscher has been one of the U.S. voting representatives on the ISO (International Standards Organization) TC108 committee, and has been the US Coordinator concerning, among other issues, machinery dynamics of centrifugal pumps and hydraulic turbine generators. He is past president of the Society of Tribologists & Lubrication Engineers (STLE), the primary technical society worldwide for the study and design of bearings, seals, wear, and erosion issues in machinery.  For the past 45 years he has been a voting member of the ASTM Fatigue Standards Committee E9, as well as the ASTM Wear & Erosion Standards Committee G2.  He is also the past Board of Directors Chairman for the Machinery Failure Prevention Technology Society (MFPT), and has been active in the Vibration Institute.   Mr. Marscher is a 23-year member of the Texas A&M Turbine-Pump Users Symposium Advisory Committee (essentially the Board of Directors for the Symposium).   For ASME, Mr. Marscher was Chair of the Predictive Maintenance committee, and was Organizing and Presiding Chair of the 1993 RoCon Rotating Machinery Conference and the 1995 Tribology Conference.

Mr. Marscher has written thirteen handbook chapters for various major engineering handbooks, which have focused on turbomachinery mechanical issues, including dynamics, and bearing and seal design   In previous employ, he was a senior engineer Pratt & Whitney Aircraft Engines, and Director of Mechanical Engineering for Worthington HQ (pumps, compressors, and turbines), and for Dresser Worthington Division after their acquisition of Worthington.   Later, he was VP of Concepts NREC, from which 30 years ago he spun off Mechanical Solutions, Inc. as an independent turbomachinery technology company.  He has since become a charter Standards Partner for the Hydraulic Institute (HI), the trade association for the pump industry, became Vice Chair of the vibration technical committee for HI, and was HI Standards Partner of the Year for 2018.   He also won the 2019 Vibration Institute MFPT Frarey Award for Diagnostics Excellence.

View MSI's Expert Witness Profile.

The four PhD and registered PEs at Miller Engineering are celebrating 40 years of Professorships at three universities along with providing services to Government, Insurance, and Industry—through research, publications, presentations, and expert testimony. We have a dedicated office with a full time staff of engineers, researchers, and technical writers. The span of our collective academic and experiential expertise covers well the Mechanical, Electrical, Chemical, Agricultural, Industrial, Human Factors, Ergonomic and Safety fields of engineering. The areas listed below are from actual projects completed in our 40 years of history. 

Auto • Airbag • Bicycle • Boating • Bus • Chair Design / Safety / Failure • Diving and Drowning • Electrocution and Shock • Elevator • Escalator • Fires and Explosions • Forklift • Gate • Golf Cart • Highway Design and Safety • Ladder • Law Enforcement • Lighting & Illumination • Loading Dock • Metallurgy • Motorcycle • Paintgun • Playground Safety • Press • Ramps • Rollercoaster • Safety Guards • Scaffolding • Seatbelts • Slip / Trip and Fall • Spas • Stairs • Swimming Pool Design and Safety • Tractors • Trailers • Trucks • 3D Scans

Dr. Kevin A. Rider, PhD, PE, CPE of Forensic Human Factors, LLC., providing forensic engineering and specializing in catastrophic motor vehicle collisions, illumination and conspicuity, driver behavior/attention/distraction, workplace safety, machine guarding, slips, trips and falls, and the adequacy of product warnings and instructions. His work focuses on identifying the Human Factors that lead to unfortunate incidents, and what should have been done to prevent them. 

Dr. Rider is a Licensed Professional Engineer and Certified Professional Ergonomist, and has studied human movements and behavior, and served as a human factors consultant since 1999, including five years teaching industrial engineering and occupational safety courses at West Virginia University. He has presented at professional conferences, both nationally and abroad, and his research is published and cited in a number of peer-reviewed journals. He continues to serve as a reviewer for conference and journal manuscripts. 

Dr. Rider has testified over 250 times, and excels at educating attorneys and jurors. His services are available to attorneys for both Plaintiff and Defense.