Browse our verified directory of expert witnesses spanning medicine, engineering, finance, and dozens of specialized fields.
Showing 289–306 of 1,756 experts
Mechanical Engineer
John D. Zeirke, P.E. is a mechanical engineering expert specializing in accident reconstruction and vehicle fire analysis. With a career spanning mechanical inspections, product liability, and forensic investigations, he brings a comprehensive technical framework to litigation work. His work centers on investigating mechanical failures, assessing product liability claims, and evaluating whether industry standards were met in vehicle accident scenarios. Mr. Zeirke has been retained in numerous expert witness and consulting engagements across the Midwest, involving vehicle accident reconstruction, fire investigations, and mechanical failure analysis. His Bachelor of Science in Mechanical Engineering from Marquette University, along with certifications such as NAFI CFEI & CVFI and ACTAR, 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 mechanical systems and vehicle accidents.
Founder and Principal
Stephen T. Hopper, P.E. is a supply chain operations expert specializing in litigation involving warehousing, fulfillment, distribution, and logistics operations. With a career spanning strategic planning, logistics network design, and supply chain solutions, he brings a comprehensive framework to litigation work. His work centers on investigating operational efficiencies, assessing compliance with industry standards, and evaluating whether safety protocols were followed. Mr. Hopper has been retained in numerous expert witness and consulting engagements across the United States, Canada, and Australia, involving cases related to supply chain operations. His Bachelor of Industrial Engineering (BIE) in Industrial Engineering from The Georgia Institute of Technology, along with his Professional Engineer (P.E.) license, 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 logistics and supply chain management.
Physician-Scientist and Professor Emeritus
James M Sonner, MD is a pharmacology and anesthesiology expert specializing in drug interactions, perioperative medication safety, and the identification of adverse drug reactions or toxic effects. With a career spanning chemistry, pharmacology, and clinical medicine, he brings a scientifically rigorous framework to litigation work involving complex pharmacological outcomes. His work centers on investigating drug interactions, assessing perioperative medication safety, and evaluating whether adverse drug reactions have occurred. Dr. Sonner has been retained in numerous expert witness and consulting engagements across the United States, involving cases related to pharmacology of the nervous system and anesthesiology. His Doctor of Medicine from Harvard Medical School, along with certifications from the American Board of Anesthesiology and the Drug Enforcement Administration, 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 drug interactions and toxicology.
PE, PTOE, AICP
Charles W. Huffine, PE, PTOE, AICP is a traffic engineering and safety expert specializing in crash assessment and transportation planning litigation. With a career encompassing municipal and consulting roles, he brings a comprehensive framework for evaluating traffic safety and engineering standards in legal contexts. His work centers on investigating crash causation, assessing compliance with traffic control standards, and evaluating whether roadway design meets safety regulations. Mr. Huffine has been retained in numerous expert witness and consulting engagements across the United States, involving cases related to highway safety, traffic engineering impacts, and construction zone safety. His Bachelor of Science in Civil and Environmental Engineering from Cornell University, along with his Certified Professional Traffic Operations Engineer (PTOE) 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 traffic engineering and roadway safety.
Senior Consultant
Karol Silva, Ph.D., M.P.H. is a human factors expert specializing in child and adolescent safety litigation. With interdisciplinary training in developmental psychology and public health, she brings a comprehensive understanding of how cognitive and motor development, risk perception, and caregiver supervision impact safety outcomes. Her work centers on investigating risk behaviors, assessing product safety features, and evaluating whether caregiver practices align with safety standards. Dr. Silva has been retained in numerous expert witness and consulting engagements across the United States, involving cases related to consumer product safety, playground equipment, and child supervision. Her Ph.D. in Developmental Psychology from Temple University, along with certifications as a Certified Playground Safety Inspector and Child Passenger Safety Technician, 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 child safety and product design.
Expert Witness
Gregory J. Cahanin is a fire and failure analysis expert specializing in origin and cause investigations. With a career encompassing fire protection engineering, code compliance, and forensic analysis, he brings a comprehensive understanding of fire dynamics and safety standards to litigation work. His work centers on investigating fire origins, assessing fire suppression system failures, and evaluating whether fire code violations contributed to incidents. Mr. Cahanin has been retained in numerous expert witness and consulting engagements across the United States, involving cases related to kitchen fire suppression systems, fire sprinklers, and fire alarm failures. His M.P.A. in Organization & Management, along with certifications such as International Code Council Fire Inspector 1, 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 fire protection systems and code compliance.
Construction, Engineering, Forensic Expert
John E. Poole III, P.E. is a construction and engineering expert specializing in forensic engineering and construction management litigation. With a career spanning civil engineering, project management, and cost estimation, he brings a multifaceted perspective to litigation work. His work centers on investigating construction defects, assessing project delays, and evaluating whether industry standards were met. Mr. Poole has been retained in numerous expert witness and consulting engagements across Pennsylvania, New York, and New Jersey, involving commercial, residential, government, and institutional projects. His M.S. in Civil Engineering/Construction Management from the University of Colorado, Boulder, along with his Professional Engineer licenses in Pennsylvania, New York, Maryland, and Florida, 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 management and forensic engineering.
Award winning chemist and materials scientist
Randal Hill, Ph.D. is a chemistry and materials science expert specializing in intellectual property and patent strategy within the chemical and materials sectors. With a career spanning roles in academia, industry, and consulting, he brings a multifaceted perspective to litigation work involving complex chemical formulations and materials innovations. His work centers on investigating patent infringement, assessing chemical product formulations, and evaluating whether industry standards in materials science have been met. Dr. Hill has been retained in numerous expert witness and consulting engagements across the United States, involving cases in the chemical, agricultural, and oil & gas industries. His Ph.D. in Physical Chemistry, along with his extensive patent portfolio and experience as a visiting scientist at MIT, reinforce his ability to deliver objective, defensible analyses. He is regularly engaged by both plaintiff and defense counsel to provide clear, independent determinations of intellectual property rights and responsibilities in disputes involving chemical and materials technologies.
Professor of Environmental Engineering
Mark O. Barnett, P H.D., P.E., BCEE is an Environmental Engineering expert specializing in water and wastewater treatment, site assessment and remediation, and soil and groundwater contamination. With a career spanning academia, industry, and government roles, he brings a multidisciplinary perspective to litigation work. His work centers on investigating contaminant behavior, assessing environmental risks, and evaluating compliance with environmental regulations. Mr. Barnett has been retained in numerous expert witness and consulting engagements across the United States, involving environmental engineering, hazardous waste management, and nuclear environmental engineering cases. His Ph.D. in Environmental Sciences and Engineering, along with his status as a Licensed Professional Engineer and Board Certified Environmental Engineer, 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 contamination and remediation.
Professional Land Surveyor, Forensic Animator
E. Steyn Visagie, Professional Land Surveyor, Forensic Animator, FAA Certified Drone Pilot is a forensic animation and scene reconstruction expert specializing in surveying, mapping, and spatial analysis for litigation. With a career spanning forensic animation, scene mapping, and spatial data visualization, he brings a comprehensive framework to analyzing complex accident and incident reconstructions. His work centers on investigating scene dynamics, assessing spatial data accuracy, and evaluating whether visual demonstratives align with factual evidence. Mr. Visagie has been retained in numerous expert witness and consulting engagements across California and Virginia, involving accident reconstructions, public sector surveying, and transportation incidents. His BSc. in Surveying from the University of Cape Town, along with his Professional Land Surveyor licenses in California and Virginia, 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 scene reconstruction and forensic animation.
Architect
Adam J. French, AIA, NCARB is a forensic architecture expert specializing in construction defects, premises liability, and property damage. With a career spanning design leadership, engineering coordination, and quality control, he brings a comprehensive architectural framework to litigation work. His work centers on investigating construction defects, assessing premises liability conditions, and evaluating whether code compliance issues have occurred. Mr. French has been retained in numerous expert witness and consulting engagements across multiple jurisdictions, involving construction defect, premises liability, and property damage cases in residential, commercial, and hospitality sectors. His Bachelor of Architecture degree from SCI-Arc, along with certifications from the National Council of Architectural Registration Boards and the Federal Aviation Administration, 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 building envelope and waterproofing systems.
CIC
Scott S. Margraves, CIC is an insurance industry expert specializing in property and casualty insurance interpretation and litigation. With a career encompassing diverse roles in insurance brokerage, claims supervision, and risk management, he brings a multifaceted perspective to his litigation work. His work centers on investigating policy compliance, assessing contractual obligations, and evaluating whether industry standards have been met. Mr. Margraves has been retained in numerous expert witness and consulting engagements across Arkansas, Colorado, Illinois, Louisiana, New Mexico, and Texas, involving cases of Bad Faith, Agency E&O, and Marine insurance, among others. His Bachelor of Science in Economics, along with his Certified Insurance Counselors (CIC) 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 standard of care in disputes involving complex insurance matters.
Board Certified in General Surgery, Board Certified in Emergency Medicine
JEFFREY DURHAM DURGIN, MD, FACS is a General Surgery and Emergency Medicine expert specializing in trauma surgery and emergency medical care. With a diverse career encompassing military service, academic roles, and clinical leadership, he brings a multifaceted perspective to litigation work. His work centers on investigating surgical outcomes, assessing emergency medical interventions, and evaluating whether standard of care deviations occurred. Dr. Durgin has been retained in numerous expert witness and consulting engagements across Texas and New Mexico, involving cases in trauma surgery, emergency medicine, and bariatric procedures. His MD in Doctor of Medicine from the University of Texas Medical School, along with certifications such as Board Certified in General Surgery and Emergency Medicine, 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 surgical and emergency medical practices.
Aviation Accident Investigator
Keith M. Cianfrani, Ed.D, (abd), MAS, CISM is an aviation accident investigation expert specializing in accident investigations and FAA enforcement proceedings. With a career spanning military aviation safety, commercial piloting, and safety consulting, he brings a multifaceted perspective to litigation work. His work centers on investigating aviation accidents, assessing risk management practices, and evaluating whether safety management systems were properly implemented. Mr. Cianfrani has been retained in numerous expert witness and consulting engagements across the United States, involving aviation accident investigations and safety audits for Part 135 and Part 91 operators, among others. His MAS in Aviation Safety from Embry Riddle Aeronautical University, along with his Certified Flight Instructor (CFI) 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 aviation safety and human factors.
Expert Witness
Bruce A. Champagne is an expert in aquatic crime scene investigations and law enforcement uses of force, specializing in crime and biomechanical analysis and behavioral profiling. With a career spanning law enforcement operations, tactical leadership, and forensic analysis, he brings a multidisciplinary perspective to litigation work. His work centers on investigating officer-involved incidents, assessing human performance factors, and evaluating whether law enforcement protocols were adhered to. Mr. Champagne has been retained in numerous expert witness and consulting engagements across the United States, involving cases related to police practices, human factors, and tactical operations. His Master of Public Administration degree, along with certifications such as Force Science Investigator and Behavioral Profiling, 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 law enforcement procedures and human performance factors.
Professor of Pharmacy Administration
Michael T. Rupp, PhD, FAPhA is a pharmacy administration expert specializing in pharmaceutical economics and health care administration litigation. With a career spanning pharmacy operations, academic leadership, and policy development, he brings a comprehensive understanding of the pharmaceutical landscape to his litigation work. His work centers on investigating medication errors, assessing dispensing practices, and evaluating whether standards of practice have been met. Mr. Rupp has been retained in numerous expert witness and consulting engagements across the United States, involving community pharmacy operations, medication safety, and healthcare policy. His Ph.D. in Pharmaceutical Administration from The Ohio State University, along with his inactive pharmacist licenses in Kansas, Missouri, New Mexico, and Ohio, 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 pharmacy administration and medication dispensing practices.
PhD, PE, ASA, MBA, CFEI
John A. Williams, PhD, PE, ASA, MBA, CFEI is an international engineering and energy technology expert specializing in engineering analysis and financial appraisals of renewable and conventional energy systems. With a career spanning intellectual property, economic damages, and regulatory analysis, he brings a multifaceted perspective to litigation work. His work centers on investigating industrial accidents, assessing energy market dynamics, and evaluating whether engineering standards have been met. Mr. Williams has been retained in numerous expert witness and consulting engagements across the United States, involving renewable energy, conventional energy, and manufacturing technologies. His Ph.D. in Chemical and Fuels Engineering, along with certifications such as Certified Fire and Explosion Investigator, 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 energy technologies and industrial processes.
Human Factors Consultant
Ellen Szubski, M.S., Ph.D., CXLT, CPSI, AHFP is a Human Factors Consultant specializing in premises liability and safety evaluations. With a career encompassing human factors analysis, safety compliance, and risk management, she brings a multifaceted perspective to litigation work. Her work centers on investigating slip, trip, and fall incidents, assessing vehicle and pedestrian crash dynamics, and evaluating whether OSHA standards were met in workplace injuries. Ms. Szubski has been retained in numerous expert witness and consulting engagements across the southeastern United States, involving cases related to premises liability, public playground incidents, and vehicle/pedestrian/bicycle crash investigations. Her Doctor of Philosophy in Human Factors Psychology, along with certifications such as Certified XL Tribometrist and Certified Playground Safety Inspector, 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 human factors and safety compliance.
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