Dr. Thomas M. Dydek specializes in the evaluation of the potential for chemical exposures to affect human health and welfare. He is a Board-Certified Toxicologist (Diplomate of the American Board of Toxicology, D.A.B.T.) with a Ph.D. in Environmental Toxicology. He also did a post-doctoral fellowship in Toxicology and is a Licensed Professional Engineer, specializing in the area of environmental engineering.

Dr. Dydek has provided expert witness services in more than 100 toxic tort cases and regulatory agency Public Hearings. His work in these cases has included the evaluation of the health risks of chemical exposures, exposures to microbial agents, and drug and/or alcohol intoxications. These exposures have occurred in the community, in occupational settings, and in other indoor environments.

Areas of Expertise:

Organic Chemicals and Solvents

Toxic Gases

Pesticides

Metals and Other Inorganic Chemicals

Petroleum Products

Robert A. Hayes is a Forensic Geologist and Environmental Consultant. He uses geologic and environmental sciences to solve problems involving water, soil, and rocks. Mr. Hayes's 33 years of experiences solving problems in both public and private service provide unique knowledge and skills to quickly and efficiently identify and analyze evidence and data, explain the implications and alternatives to his clients and help devise win / win solutions.

Expertise Include:

Baseline Environmental Assessments Contaminant Age-Dating Consultant Oversight/Review Contaminant Source Identification Environmental Impact Statements Environmental Site Assessments Forensic Geology Analyses Geologic Expert Witness Testimony Groundwater Contamination Investigation and Remediation Groundwater Discharge Permits Hydrogeologic Investigations

Lake Level Stabilization Landfill Impacts Leaking Underground Storage Tanks Peat Mining Permitting and Mitigation Rock-Fall Investigation Sand and Gravel Mining Impacts Superfund (CERCLA) Site Investigation & Remediation Sedment Source Identification Soil Contamination Trench/Excavation Collapse Water Supply Contamination

Gershman, Brickner & Bratton, Inc. (GBB) is an international management consulting firm that helps public- and private-sector organizations of all sizes craft practical, customized and technically sound solutions for a wide range of complex solid waste management challenges.

Since 1980, we have assisted hundreds of communities and companies throughout the United States and abroad, earning a reputation for achieving results through hard work and by treating our clients’ challenges as our own. As we address our clients’ current challenges, we also look to the future and have a reputation for creating long-term sustainable solid waste programs that continue to save money and bring results for years to come.

We plan and develop integrated waste management programs that do more with less. These programs improve efficiency, save money, enhance customer service and protect the environment. We also step in to actually manage solid waste operations and facilities, with results that include improved allocation of resources, expanded services, and reduced costs and customer complaints.

We pride ourselves in offering a broad array of experience, skills and technical resources. We are strategic, entrepreneurial and flexible. Our senior-level professionals work in partnership with our clients to develop innovative, cost-effective approaches that achieve measurable results.

Expert Witness Services

With more than a century of total years in the industry, GBB’s officers are uniquely qualified to give expert witness testimony and dispute resolution service on waste industry cases, including:

Contractual and other business disputes

Disposal fee and cost assessment disputes

Environmental pollution liability and potential responsible party cost allocation

Facility designation lawsuits

Personal or worker injury

Statutory and regulatory interpretation

Technology evaluations, license disputes and patent infringement

Waste characterization and market evaluations

Waste flow control lawsuits

Technical assistance to counsel in litigation involving Chemical and Environmental Forensics, Hazardous Waste, Hazardous Materials, Regulatory Compliance, Dioxins, Fires and Explosions at waste facilities and cement plants, and injury or chemical exposure claims due to hazardous materials or hazardous operations.

GCI provides the technical expertise and develops the evidentiary basis for legal arguments relying on or involving:

Industrial and environmental chemical forensic analysis

Causation proved by fate and transport of chemicals and their degradation products in the environment

Appropriate standard of care for and regulations of hazardous waste and hazardous materials

Safety and prevention of catastrophic events such as fires and explosions

Prevention of injury or chemical exposure resulting from hazardous materials or hazardous materials operations

Prevention of chemical spills and/or proper management of historical environmental contamination

Ray Helmer is a Licensed Professional Engineer in the states of Texas, Oklahoma, Alabama and Ohio. He is available to perform Expert Witness Services in all 50 states.

At present, Mr. Helmer enjoys working in depth on Water & Wastewater cases such as: water supplies, toxic contamination, industrial pollution, water intrusion, and flooding.

Areas of Expertise:

Civil, Structural and Forensic engineering

Highway engineering, roadways, sight distance

Concrete and Asphalt Pavements

Highway / Street lighting

Traffic engineering, signals, signs, striping

Traffic noise studies

Accidents – automobile, train, motorcycle, pedestrian

Traffic accident testimony involving city / County / State DOTS

Hydraulics, hydrology, drainage, flooding

Sanitary engineering, sewers, overflows

Water treatment, distribution, pumping

Water disinfection byproducts (DBPs)

Wastewater treatment plants, lift stations

Soil expansion, contraction, settlement

Foundation failure, structural damage

Plumbing, leaks, water intrusion

Airports, FAA standards, runways, taxi ways, ramps

Bridges, buildings, corrosion, concrete cracking

Construction defects, fraud, accidents, delays, estimates

John J. Oransky has over thirty years of experience in Chemical and Environmental Engineering, Industrial Hygiene, Safety and Technical Training.

Areas of Expertise:

Chemical Process Development and Design Project Engineering Environmental Engineering Industrial Hygiene Health & Safety Optimization and Waste Minimization Assessments

Evaluations Field and Plant Testing Technical Training Patent Work Program Upgrade and Development Verbal and Written Presentations

Headquartered in Houston with over 30 U.S. offices plus London, Rimkus Consulting Group, Inc. is a global leader in forensic investigations, forensic engineering, forensic sciences and forensic accounting. Rimkus offers the services of over 300 full-time seasoned professionals with expertise in virtually all technical and business fields. In business for over 25 years, clients include the Domestic and International Insurance Industry, Attorneys, Industrial and Commercial Health, Safety and Risk Managers, and others.

Rimkus takes pride in its professional approach to all assignments. Each assignment is performed under the assumption that litigation will ensue, and appropriate records and evidentiary chains of custody are maintained. Client communications are clear and explanatory to insure that opinions and conclusions are complete and well supported.

Many clients find Rimkus to be their one-stop shopping place for experts. Rimkus offers forensic expert witnesses and forensic consultants in most technical fields, including all areas of Engineering, Construction, Environmental Sciences, Fires and Explosions, Oil and Gas, Forensic Accounting, Business Interruption Claims, Surety, Business Valuations, Business Analysis, Safety and Industrial Hygiene, and Animation. In the forensic engineering arena alone, we offer virtually all disciplines including:

Forensic Mechanical Engineers

Forensic Electrical Engineers

Forensic Civil Engineers

Forensic Structural Engineers

Forensic Chemical Engineers

Forensic Metallurgical Engineers

Forensic Naval Engineers

Complex technical claims often require the use of experts in more than one field to find the right answer. Rimkus brings that to you. Our website features detailed information on our areas of expertise and short CVs of key Rimkus experts in those areas. Give us a try. You'll be glad you did.

Construction Practice at Robson Forensic

The Construction Practice at Robson Forensic consists of experts in architecture and civil, structural, mechanical, and electrical engineering. Our experts have designed, built and maintained residential, industrial, institutional, municipal, heavy civil and commercial buildings and structures.

Our Construction Group consists of more than 50 experts across 17 locations. Please contact one of the practice group leaders below to discuss your case and determine which of our experts is most appropriate to assist with your matter.

Mark E. Williams, AIA, NCARB
Architectural / Professional Liability Expert

Mark is a broadly experienced architect with a diverse career that included new construction, adaptive-reuse, and renovation projects on a wide range of building types and occupancies. Through his 25 years of experience and his focus on problem solving, Mark provides technical investigations and expert analysis on construction contract disputes, large construction defect claims, and matters of architect professional liability including claims of bad faith. View Curriculum Vitae



Brent Leisenring, P.E.
Civil Engineering / Construction Safety Expert

Brent is a Civil Engineer with more than 30 years of hands-on experience in construction and engineering. He has experience in construction as a contractor, construction manager, engineer, subcontractor and material supplier on projects ranging from single-family dwellings to oil refineries. His unique background and experience qualify him to analyze the actions and responsibilities of all parties involved to determine liability for defective construction as well as unsafe conditions on construction sites. He is a Professional Engineer in five states and has testified in several states. View Curriculum Vitae



Dale Cagwin, P.E.
Building Systems Expert

Dale’s experience includes over 20 years as a mechanical engineer designing, testing and maintaining building systems including fire suppression, HVAC, plumbing, gas, water and sewage in a variety of commercial, industrial, institutional and municipal buildings. Dale has served on standards writing committees and worked with product approval agencies. He is a P.E. in seven states, a Certified Fire Investigator and has testified in a broad range of building systems cases. View Curriculum Vitae

45+ years of independent, multi-disciplinary scientific experience in basic and applied research, university teaching and large commercial laboratory operations for your litigation/consultation needs. Nationally known expert in over 400 individual, consolidated and class action cases. Daubert - qualified.

Civil & Criminal (for defense/plaintiff/prosecution)

FELA/Admiralty Law/Military court qualified

Workmen's Comp Hearings

Insurance claim investigations

Union-Government Arbitration Hearings

EPA Arbitration Negotiations

Governmental & Congressional Hearings and Commissions

Peer Reviewer for EPA and NIOSH

Reviewer for Natl Science Foundation

Toxic & carcinogen exposure assessments & retrospective modeling of past exposure histories

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