Environmental Engineering
Mr. Harold (Ed) E. von Dran Jr.
Registered Professional Engineer
San Antonio, TX45 years+ yrs★ 8.4
Construction DefectsEnvironmental Program/Project ManagementRegulatory Compliance & Government Relations+6
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Clear filtersRegistered Professional Engineer
Harold E. von Dran Jr., PE is an Environmental Engineering expert specializing in environmental litigation and regulatory compliance. With a career spanning environmental program management, construction defect analysis, and regulatory negotiations, he brings a strategic framework to litigation work. His work centers on investigating environmental contamination, assessing regulatory compliance, and evaluating infrastructure design failures. Mr. von Dran has been retained in numerous expert witness and consulting engagements across Texas, Arkansas, Louisiana, and beyond, involving environmental contamination cases, construction defects, and regulatory compliance disputes. His MS in Environmental Science, along with his Certified Energy Manager designation, reinforce his ability to deliver objective, defensible analyses. He is regularly engaged by both plaintiff and defense counsel to provide clear, independent determinations of causation in disputes involving environmental impact assessments and facility design compliance.
Consulting Engineer in Civil Engineering
Keith A. Bergman, PE is a civil engineering expert specializing in highway and street design, traffic engineering, and utilities construction. With extensive experience in construction management, project-related claims, and job site safety, he brings a comprehensive understanding of codes and standards to his litigation work. His work centers on investigating premise liability, assessing pedestrian safety, and evaluating whether ADA compliance has been met. Mr. Bergman has been retained in numerous expert witness and consulting engagements across the United States, involving premises liability, traffic engineering, and construction management cases. His Bachelor of Science Degree in Civil Engineering from San Diego State University, along with his Professional Engineer certifications in multiple states, reinforce his ability to deliver objective, defensible analyses. He is regularly engaged by both plaintiff and defense counsel to provide clear, independent determinations of responsibility in disputes involving walkway surface evaluations, storm drainage, and pedestrian safety.
President & Principal Engineer
Gregg S. Perkin, PE is a mechanical engineering expert specializing in mechanical equipment design and safety systems. With extensive experience across domestic and international projects, he brings a multifaceted perspective to litigation work involving complex mechanical systems. His work centers on investigating mechanical failures, assessing safety compliance, and evaluating whether industry standards were met in equipment design and operation. Mr. Perkin has been retained in numerous expert witness and consulting engagements across the United States, involving cases related to oil and gas drilling equipment, mechanical systems design, and accident reconstruction. His Bachelor of Science in Mechanical Engineering from California State University at Long Beach, along with his registration as a Professional Engineer in thirteen states, reinforces his ability to deliver objective, defensible analyses. He is regularly engaged by both plaintiff and defense counsel to provide clear, independent determinations of causation in disputes involving mechanical equipment and safety systems.
Crash Reconstructionist-Forensic Mapper, CDR Analyst-Technician
Daniel Holmes, A.C.T.A.R. #2455 is a crash reconstruction expert specializing in forensic mapping and CDR analysis. With a career spanning accident investigation, forensic mapping, and crash data retrieval, he brings a robust analytical framework to litigation work. His work centers on investigating crash dynamics, assessing vehicle and scene data, and evaluating whether industry standards were met. Mr. Holmes has been retained in numerous expert witness and consulting engagements across Minnesota, involving cases related to vehicle collisions, pedestrian accidents, and commercial vehicle incidents. His Bachelor Degree of Science in Law Enforcement, along with certifications such as Full Accreditation - Traffic Accident Reconstructionist and MN Licensed Peace Officer, reinforce his ability to deliver objective, defensible analyses. He is regularly engaged by both plaintiff and defense counsel to provide clear, independent determinations of causation in disputes involving crash reconstruction and forensic mapping.
Highly Experienced Expert, Summa Cum Laude
Thomas Collier, Jr is a construction and premises liability expert specializing in large commercial and multi-residential construction disputes and serious bodily injury claims. With a career spanning general contracting, development, and consulting, he brings a comprehensive understanding of construction practices and liability issues to his litigation work. His work centers on investigating construction defects, assessing premises liability, and evaluating whether industry standards were met. Mr. Collier has been retained in numerous expert witness and consulting engagements across the Southeastern United States, involving commercial defects, personal injury claims, and multifamily construction cases. His BA in Economics and English from the University of North Carolina at Chapel Hill, along with his Licensed Contractor certification in Georgia, reinforce his ability to deliver objective, defensible analyses. He is regularly engaged by both plaintiff and defense counsel to provide clear, independent determinations of responsibility in disputes involving construction defects and premises liability.
Loss Control, Risk Management & Safety Consultant
Mark Clinton, MBA, ARM is a Loss Control and Risk Management expert specializing in premises liability and amusement safety. With a career encompassing diverse sectors such as construction, insurance, and safety consulting, he brings a multifaceted perspective to litigation work. His work centers on investigating premises liability incidents, assessing compliance with safety standards, and evaluating whether risk management protocols were followed. Mr. Clinton has been retained in numerous expert witness and consulting engagements nationwide, involving cases related to amusement parks, construction safety, and insurance loss control. His Masters of Business Administration in Finance and Insurance, along with certifications such as OSHA 500 and OSHA 501 Outreach Trainer, reinforce his ability to deliver objective, defensible analyses. He is regularly engaged by both plaintiff and defense counsel to provide clear, independent determinations of responsibility in disputes involving safety compliance and risk management practices.
Forensic Animator/Technical Animator/Legal Graphic Designer/Medical Illustrator
David Yarr is a forensic animation and visualization expert specializing in accident reconstruction and legal graphics. With a career spanning forensic animations, accident reconstruction visualization, and medical illustrations, he brings a multidisciplinary approach to litigation work. His work centers on producing demonstrative evidence, conducting video analysis, and integrating EDR/black box data. Mr. Yarr has been retained in numerous expert witness and consulting engagements across the United States, involving personal injury cases, vehicle collisions, and medical device litigations. His coursework in Digital Animation, along with certifications such as LEVA Level 1, Forensic Video Analysis & the Law, reinforce his ability to deliver objective, defensible analyses. He is regularly engaged by both plaintiff and defense counsel to provide clear, independent determinations of causation in disputes involving accident scenarios and forensic visualizations.
Principal, Forensic Architect
Christopher D. Ling, AIA, NCARB, PP, LEED AP, CCT is a forensic architecture expert specializing in construction litigation and architectural standard of care. With a career spanning architectural design, construction defect analysis, and expert testimony, he brings a comprehensive understanding of construction project intricacies to his litigation work. His work centers on investigating construction defects, assessing architectural standards of care, and evaluating whether building codes have been adhered to. Mr. Ling has been retained in numerous expert witness and consulting engagements across the United States, involving complex construction defect cases and architectural standard of care disputes. His Bachelor of Architecture in Architecture, along with certifications such as the NCARB Certificate and Certified Cost Technician (CCT), reinforce his ability to deliver objective, defensible analyses. He is regularly engaged by both plaintiff and defense counsel to provide clear, independent determinations of responsibility in disputes involving construction claims and architectural practices.
Certified Flooring Inspector & Instructor
William (Will) Stoner, Certified Flooring Inspector & Instructor is a flooring inspection and forensic analysis expert specializing in slip, trip, and fall cases, as well as construction defects. With a career encompassing roles in installation, retail, and inspection, he brings a multifaceted perspective to litigation work, informed by his extensive experience in forensic flooring analysis and industry standards compliance. His work centers on investigating installation failures, assessing product defects, and evaluating whether maintenance protocols meet safety standards. Mr. Stoner has been retained in numerous expert witness and consulting engagements across the United States, involving residential and commercial flooring disputes, manufacturing defects, and safety compliance issues. His Bachelor's Degree in Marketing, along with certifications such as NFSI Walkway Auditor Safety Specialist and NWFA-CP Certified Wood Flooring Inspector, reinforce his ability to deliver objective, defensible analyses. He is regularly engaged by both plaintiff and defense counsel to provide clear, independent determinations of causation in disputes involving flooring failures and safety evaluations.
Supervising Civil Engineer – Transportation / Signals / ITS
Jocelyn Mamchur, PE is a transportation engineering expert specializing in traffic signal systems and Intelligent Transportation Systems (ITS) litigation. With extensive experience in municipal engineering and public agency standards, she brings a nuanced understanding of design compliance and safety analysis to her litigation work. Her work centers on investigating traffic signal failures, assessing compliance with engineering standards, and evaluating whether deviations from the Manual on Uniform Traffic Control Devices (MUTCD) have occurred. Ms. Mamchur has been retained in numerous expert witness and consulting engagements across the Pacific Northwest, involving municipal liability and pedestrian safety cases. Her Bachelor of Science in Engineering from the University of Manitoba, along with her Professional Engineer (PE) license in Washington State, reinforce her ability to deliver objective, defensible analyses. She is regularly engaged by both plaintiff and defense counsel to provide clear, independent determinations of standard of care in disputes involving traffic control devices and roadway lighting.
Mechanical Engineering, Accident Reconstruction, Biomechanics and Safety Expert
Kristopher J Seluga, Licensed Professional Engineer is a mechanical engineering expert specializing in accident reconstruction, biomechanics, and safety. With a career encompassing dynamic testing, software development for accident simulations, and forensic engineering, he brings a multifaceted analytical perspective to litigation work. His work centers on investigating motor vehicle and machinery accidents, assessing product liability claims, and evaluating safety compliance in construction and industrial settings. Mr. Seluga has been retained in numerous expert witness and consulting engagements across Connecticut and New York, involving motor vehicle accidents, product liability, and premises liability cases. His M.S. in Mechanical Engineering from M.I.T., along with OSHA 10-hour Construction Safety and Health Certification, reinforce his ability to deliver objective, defensible analyses. He is regularly engaged by both plaintiff and defense counsel to provide clear, independent determinations of causation in disputes involving accident dynamics and safety standards.
Principal Structural Engineer
Vanessa M. Malone, P.E. is a structural engineering expert specializing in forensic investigations and expert witness work. With a career spanning aerospace, defense, and nuclear industries, she brings a multidisciplinary perspective to litigation work. Her work centers on investigating structural collapses, assessing construction defects, and evaluating hurricane and wind damage. Ms. Malone has been retained in numerous expert witness and consulting engagements across the United States, involving structural collapses, construction defects, and hurricane damage cases. Her M.Sc. in Civil Engineering: Computational Mechanics, along with P.E. Licenses in FL, NY, LA, GA, MO, TX, reinforce her ability to deliver objective, defensible analyses. She is regularly engaged by both plaintiff and defense counsel to provide clear, independent determinations of causation in disputes involving structural failures and construction defects.
FAIA, NCARB, LEED AP, CRRP
Gary K. Dempster, FAIA, NCARB, LEED AP, CRRP is an architecture and construction expert specializing in professional standard of care and construction documents analysis. With a career spanning project management, technical services, and architectural mediation, he brings a comprehensive framework for evaluating compliance with industry standards in complex construction disputes. His work centers on investigating professional standard of care breaches, assessing construction document integrity, and evaluating whether architectural coordination meets regulatory requirements. Mr. Dempster has been retained in numerous expert witness and consulting engagements across the United States, involving retail, hospitality, and historic preservation projects. His Bachelor of Science in Architecture from the University of Southern California, along with certifications such as NCARB, LEED AP, and CRRP, reinforce his ability to deliver objective, defensible analyses. He is regularly engaged by both plaintiff and defense counsel to provide clear, independent determinations of standard of care in disputes involving architectural design and construction administration.
AIA – NCARB Professional Architect
James Rappoport, AIA – NCARB is an architectural expert specializing in ground-up, renovation, and historic adaptive reuse projects. With a career spanning urban design, planning, and architectural practice, he brings a comprehensive framework to litigation work involving complex design and construction disputes. His work centers on investigating building code compliance, assessing architectural design standards, and evaluating whether professional liability has been met. Mr. Rappoport has been retained in numerous expert witness and consulting engagements across the USA and internationally, involving cases related to office facilities, hotels, resorts, and retail developments. His Bachelor of Architecture from Cornell University and M. Sc. in Architecture & Urban Design from Columbia University, along with certifications from the National Council of Architectural Registration Boards (NCARB), reinforce his ability to deliver objective, defensible analyses. He is regularly engaged by both plaintiff and defense counsel to provide clear, independent determinations of standard of care in disputes involving architectural design and construction practices.
Bicycle Expert
J Lucas Elrath, Bicycle Expert is a bicycle accident reconstruction expert specializing in commercial and personal injury litigation involving bicycles and wheeled vehicles. With a career encompassing bicycle design, manufacturing, and maintenance, he brings a comprehensive understanding of how these elements impact rider safety and accident causation. His work centers on investigating crash dynamics, assessing design and manufacturing defects, and evaluating whether maintenance practices contributed to accidents. Mr. Elrath has been retained in numerous expert witness and consulting engagements across the United States, involving cases related to bicycle design, manufacturing defects, and crash reconstruction. His B.S. in Electrical Engineering, along with certifications such as E-Bike Fundamentals Certification and Certified Bicycle Technician, reinforce his ability to deliver objective, defensible analyses. He is regularly engaged by both plaintiff and defense counsel to provide clear, independent determinations of causation in disputes involving bicycle accidents and related safety issues.
Chief Forensic Engineer
Ronald A Bova, PE, DFE is a forensic engineering expert specializing in structural failure analysis and construction defects. With a career spanning structural engineering, forensic investigation, and civil engineering liability, he brings a comprehensive framework to litigation work. His work centers on investigating structural failures, assessing construction defects, and evaluating whether civil engineering standards were met. Mr. Bova has been retained in numerous expert witness and consulting engagements across the United States, involving structural failure analysis and construction defect cases. His B.S. in Civil Engineering Technology, along with his Board Certified Diplomate in Forensic Engineering, reinforce his ability to deliver objective, defensible analyses. He is regularly engaged by both plaintiff and defense counsel to provide clear, independent determinations of causation in disputes involving structural and civil engineering issues.
CEO and Lead Forensic Expert
Jason Fries, Advanced Force Science Specialist, Force Science Certificate, Private Pilot Certificate is a forensic reconstruction expert specializing in accident reconstruction and forensic animation. With a career spanning the development of laser-based photogrammetry and the introduction of 3D reconstructions into courtrooms, he brings a pioneering perspective to litigation work. His work centers on investigating officer-involved shootings, assessing nighttime visibility, and evaluating whether forensic animations meet admissibility standards. Mr. Fries has been retained in numerous expert witness and consulting engagements across the United States, involving civil and criminal cases, including officer-involved shootings and accident reconstructions. His B.S. in Biology (Focus in Physics and Chemistry), along with certifications such as Advanced Force Science Specialist and Force Science Certificate, reinforce his ability to deliver objective, defensible analyses. He is regularly engaged by both plaintiff and defense counsel to provide clear, independent determinations of causation in disputes involving forensic reconstructions and human factors.
Light Rail & Transit Systems Expert Witness
Timothy Borchers is a light rail and transit systems expert specializing in safety certification and regulatory compliance in public transportation. With a career encompassing management, operational, technical, and regulatory experience in both public and private sectors, he brings a comprehensive framework to his litigation work. His work centers on investigating accident causation, assessing regulatory adherence, and evaluating whether safety management systems meet industry standards. Mr. Borchers has been retained in numerous expert witness and consulting engagements across the United States, involving light rail and streetcar accidents, automated people mover incidents, and transit bus accidents. His Bachelor of Business Administration in Management, along with certifications such as Transit Rail System Safety and Transit Rail Incident Investigation, reinforce his ability to deliver objective, defensible analyses. He is regularly engaged by both plaintiff and defense counsel to provide clear, independent determinations of causation in disputes involving transit system safety and regulatory compliance.
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