Toxicology
David M. Lehmann, Ph.D.
Criminal Justice and Security Consultant
Raleigh, NC40+ years+ yrs★ 9.2
Infectious DiseasesToxicology & EcotoxicologyToxicological Risk Assessment+27
Browse our verified directory of expert witnesses spanning medicine, engineering, finance, and dozens of specialized fields.
Showing 73–90 of 1,756 experts
Criminal Justice and Security Consultant
Roy G. Taylor, Ph.D. is a criminal justice and security consulting expert specializing in police procedures and law enforcement training. With a career spanning federal, state, and local law enforcement leadership roles, he brings a comprehensive perspective to analyzing law enforcement practices and procedures. His work centers on investigating use of force incidents, assessing police pursuit tactics, and evaluating the implementation of law enforcement policies. Mr. Taylor has been retained in numerous expert witness and consulting engagements across the United States, involving police practices, law enforcement training, and security management. His Ph.D. in Criminal Justice from Walden University, along with certifications such as Certified Homeland Security Specialist III and Advanced Force Science Specialist, 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 use of force and police procedures.
MD, MPH, FACOEM, FAAN
Jonathan Silver Rutchik, MD, MPH, FACOEM, FAAN is a Neurology and Occupational Medicine expert specializing in neurotoxicology and environmental medicine litigation. With a career encompassing neurology, electromyography, and occupational health, he brings a multidisciplinary perspective to his litigation work. His work centers on investigating chemical exposure impacts, assessing occupational health risks, and evaluating whether neurotoxicological standards have been met. Dr. Rutchik has been retained in numerous expert witness and consulting engagements across the United States, involving cases related to chemical exposures, workplace injuries, and toxic neuropathy. His Doctor of Medicine from Hahnemann Medical College, along with Board Certified Diplomate status from the American Board of Preventive Medicine and the American Board of Psychiatry and Neurology, 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 neurotoxicology and occupational health.
Professional Engineer | Construction & Federal Infrastructure Expert
Colonel (Ret.) Robert Carpenter, P.E., CGC is a construction and federal infrastructure expert specializing in engineering quality control and program oversight. With a career spanning construction project management, federal procurement, and disaster recovery operations, he brings a strategic framework to litigation work involving complex infrastructure and regulatory compliance. His work centers on investigating construction standards of care, assessing compliance with Federal Acquisition Regulations, and evaluating whether FEMA Public Assistance program requirements have been met. Mr. Carpenter has been retained in numerous expert witness and consulting engagements across Florida, Virginia, and Puerto Rico, involving federal construction standards, disaster recovery operations, and USACE infrastructure projects. His MS in Civil Engineering from Stanford University, along with certifications such as LEED and his licenses as a Professional Engineer in multiple jurisdictions, 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 federal procurement and infrastructure projects.
PhD, PE
Jay M. Vincelli, PhD, PE is a forensic analysis expert specializing in medical devices for product liability and patent litigation. With a cross-disciplinary background in biomedical engineering, materials science, and mechanical engineering, he brings a multifaceted perspective to his litigation work. His work centers on investigating device failures, assessing compliance with industry standards, and evaluating whether design defects contributed to adverse outcomes. Dr. Vincelli has been retained in numerous expert witness and consulting engagements across the United States, involving cases such as orthopedic implants, transvaginal mesh, and cardiac devices. His PhD in Electrical, Computer & Biomedical Engineering, along with certifications such as NAMSA Training ISO 10993 Biological Evaluation of Medical Devices and ISO 9001 Lead Auditor Training, 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 complex medical device failures.
Expert Witness
Capt. David G. Bacon is a maritime expert specializing in boating accidents and marina safety litigation. With a career encompassing boat charter operations, maritime nonprofit leadership, and extensive editorial work in marine electronics, he brings a multifaceted perspective to his litigation work. His work centers on investigating vessel operation failures, assessing captain and crew responsibilities, and evaluating compliance with maritime safety standards. Mr. Bacon has been retained in numerous expert witness and consulting engagements across California, involving cases related to boating accidents, equipment failures, and maritime safety. His Associate Arts degree in Business Administration, along with his U.S. Coast Guard licensed vessel captain 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 responsibility in disputes involving vessel operation and safety compliance.
Neurosurgeon
Ronald H. Uscinski, Ph.D., MSSM, MSPA, B.S., M.S., A.A. is a neurosurgery and pediatrics expert specializing in shaken baby syndrome and birth-related intracranial bleeding. With a career spanning human factors, behavioral and social sciences, and aerospace physiology, he brings a multidisciplinary perspective to litigation work. His work centers on investigating the origins of subdural hematomas, assessing the impact of birth trauma, and evaluating whether alternative hypotheses to manual shaking are supported. Mr. Uscinski has been retained in numerous expert witness and consulting engagements across the United States, involving cases related to neurosurgery, pediatrics, and accident analysis. His Ph.D. in behavioral neuroscience, along with certifications in ergonomics and professional modeling and simulation, 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 shaken baby syndrome and birth-related injuries.
Management Consultant and Expert Witness
Eric S. Heinz, MBA is a Medtech industry expert specializing in litigation involving medical devices, FDA regulatory processes, and intellectual property disputes. With a career spanning general management, mergers and acquisitions, and product development, he brings a strategic and operational perspective to complex litigation matters. His work centers on investigating regulatory compliance, assessing product liability, and evaluating intellectual property claims. Mr. Heinz has been retained in numerous expert witness and consulting engagements across the United States, involving cases related to medical devices, mergers and acquisitions, and commercial practices. His Executive MBA in Corporate Strategy/Finance from Northwestern University, along with certifications such as Registered United States Patent Agent and Certified Project Management Professional, 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 and responsibility in disputes involving medical devices and related commercial practices.
Clinical, Rehabilitative, Academic, Forensic, Practice Management, CAOHC CD-PS/A, & Consulting Audiologist
Robert M. Traynor, Ed.D., MBA, DFAAA is an audiology expert specializing in forensic audiology and hearing rehabilitation litigation. With a career spanning clinical practice, academic instruction, and audiology consulting, he brings a multifaceted perspective to his litigation work. His work centers on investigating audiological malpractice, assessing hearing and tinnitus rehabilitation, and evaluating whether industry standards were met in audiology practice management. Mr. Traynor has been retained in numerous expert witness and consulting engagements across the United States, involving cases related to audiology malpractice, hearing instrument efficacy, and tinnitus treatment. His Doctor of Education in Special Ed/Audiology, along with certifications such as the American Board of Audiology Certification and the Certificate of Clinical Competence in Audiology, 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 hearing loss and tinnitus.
DNAPc, CRNA
Jill M. Krystofinski Mantell, DNAPc, CRNA is an anesthesiology expert specializing in medicolegal consultation for anesthesia-related litigation. With a career spanning nurse anesthesia practice, educational consultation, and medicolegal analysis, she brings a multifaceted perspective to her litigation work. Her work centers on investigating anesthesia-related incidents, assessing compliance with anesthesia protocols, and evaluating whether deviations from standard care occurred. Ms. Krystofinski Mantell has been retained in numerous expert witness and consulting engagements across the United States, involving cases related to anesthesia awareness, burn surgery, and gender-affirming surgery. Her Master of Science in Nursing, along with certifications such as Pediatric Advanced Life Support Provider and Neonatal Resuscitation Certification Provider, 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 anesthesiology and nurse anesthesia practices.
MSME, P.E., DFE
John Thomazin, MSME, P.E., DFE is a mechanical and electrical systems expert specializing in forensic engineering and accident reconstruction. With a career spanning software development, manufacturing, consulting, and academia, he brings a multifaceted engineering perspective to litigation work. His work centers on investigating vehicle accident reconstructions, assessing product and premises liability, and evaluating whether mechanical failures have occurred. Mr. Thomazin has been retained in numerous expert witness and consulting engagements across the United States, involving vehicle accidents, farm equipment incidents, and structural assessments. His Master of Science in Mechanical Engineering, along with certifications such as Certified XL Tribometrist and ACTAR Accredited Traffic Accident Reconstructionist, 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 and electrical systems.
Certified Forensic Identification Consultant
Kourosh Nikoui, Certified Forensic Identification Consultant is a forensic identification expert specializing in crime scene investigation and latent print analysis. With a career spanning forensic science, criminalistics, and forensic photography, he brings a multidisciplinary perspective to his litigation work. His work centers on investigating crime scenes, assessing latent print evidence, and evaluating the authenticity of forensic identifications. Mr. Nikoui has been retained in numerous expert witness and consulting engagements across the United States, involving complex forensic identification and crime scene reconstruction cases. His Bachelor Degree in Fine Arts in Photography, along with certifications as a Certified Latent Print Examiner, Certified Senior Crime Scene Analyst, and Certified Forensic Photographer, 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 forensic identification and crime scene analysis.
Security Consultant
Mark Harless, MS, PSP is a security consultant expert specializing in security negligence and premises liability litigation. With a career that spans federal law enforcement and corporate cybersecurity, he brings a unique blend of investigative and strategic insight to his litigation work. His work centers on conducting security assessments, developing risk mitigation strategies, and evaluating compliance with industry standards. Mr. Harless has been retained in numerous expert witness and consulting engagements across the United States, involving cases related to security negligence, premises liability, and complex fraud analysis. His Master of Science in Criminology from Florida State University, along with his Physical Security Professional (PSP) 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 responsibility in disputes involving physical security and threat intelligence.
Hospitality Industry Expert in Standard of Care and Operational Disputes
Kenneth C. Free, MBA, RRP, CMHS is a hospitality industry expert specializing in standard of care and operational disputes. With a career spanning hotel operations, asset management, development, and financial oversight, he brings a real-world operational framework to analyzing where deviations from industry standards may have occurred. His work centers on investigating hospitality standard of care, assessing business interruption damages, and evaluating whether hotel operations liability has been breached. Mr. Free has been retained in numerous expert witness and consulting engagements across the United States and internationally, involving hospitality standard of care, business interruption damages, and hotel operations liability. His MBA in Finance, along with Registered Resort Professional (RRP) and Certified Master Hotel Supplier (CMHS) certifications, 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 hospitality operations.
Forensic Accounting and Auditing Expert
Jack W. Harris, CPA, CFE, CIA, CVA, CFF, CGMA, MAFF is a forensic accounting and auditing expert specializing in claims and damages analysis. With a career spanning construction, mining, energy, real estate, and insurance sectors, he brings a multifaceted perspective to litigation work. His work centers on investigating financial discrepancies, assessing damages quantification, and evaluating whether fraud has occurred. Mr. Harris has been retained in numerous expert witness and consulting engagements across the United States and internationally, involving construction, mining, energy, and real estate cases. His M.B.A. in Finance, along with certifications as a Certified Public Accountant, Certified Fraud Examiner, Certified Internal Auditor, Certified Valuation Analyst, Certified in Financial Forensics, Chartered Global Management Accountant, and Master Analyst in Financial Forensics, 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 financial management and fraud investigations.
Managing Partner | Expert Witness – Physical Security
Shawn F. Wurtsmith, MBA, PSP is a physical security expert specializing in inadequate/negligent security and premises liability litigation. With a career spanning security program management, threat and vulnerability assessment, and emergency response planning, he brings a strategic framework to analyzing security failures and operational deviations. His work centers on investigating security negligence, assessing premises liability, and evaluating whether emergency response protocols meet industry standards. Mr. Wurtsmith has been retained in numerous expert witness and consulting engagements nationwide, involving cases across governmental, healthcare, cannabis, petrochemical, hospitality, defense, and themed entertainment sectors. His Master of Business Administration in Business Management, along with certifications such as Physical Security Professional (PSP), 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 physical security standards and negligence.
Ph.D, PMP
Jihye Kim (Hanson), Ph.D, PMP is a chemical engineering expert specializing in product liability and safety, patent disputes, and toxicology. With a career spanning product development, chemical safety, and intellectual property across the oil & gas, water treatment, and agriculture sectors, she brings a multidisciplinary perspective to her litigation work. Her work centers on investigating product failures, assessing chemical exposure risks, and evaluating whether regulatory compliance was met. Ms. Kim has been retained in numerous expert witness and consulting engagements across the United States, involving cases in the oil & gas, water treatment, and agriculture industries. Her Doctorate in Chemical Engineering from Texas Tech University, along with her Project Management Professional (PMP) Certification, 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 chemical safety and product liability.
Design or CAD/CAM Engineering, Technical Writer, Manufacturer, Builder, Machinist & Certified Welder
Michael Troy Richardson, BS, MA, MS is an aerial adventure and amusement attraction safety expert specializing in litigation involving zipline and trampoline park accidents. With a career spanning engineering, technical writing, and product development, he brings a multi-disciplinary perspective to analyzing safety standards and operational compliance in the amusement industry. His work centers on investigating accident causation, assessing compliance with safety standards, and evaluating whether operational negligence contributed to incidents. Mr. Richardson has been retained in numerous expert witness and consulting engagements across the United States, involving cases in the aerial adventure, zipline, and amusement park industries. His MS in Engineering & Technology, along with certifications such as the National Board Certified Pressure Vessel Welder, 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 amusement ride safety and operational standards.
Undersheriff
Christopher Darcy, MA is a police practices expert specializing in use of force, duty to intervene, and in-custody deaths. With a career spanning leadership roles in law enforcement, including serving as Undersheriff of the Las Vegas Metropolitan Police Department, he brings a strategic and operational framework to his litigation work. His work centers on investigating police conduct, assessing compliance with law enforcement standards, and evaluating whether departmental policies were adhered to. Mr. Darcy has been retained in numerous expert witness and consulting engagements across the United States, involving cases of negligent security, wrongful arrest, and civil unrest. His Master of Arts in Administrative Leadership, along with certifications such as the FBI National Academy and NV P.O.S.T. Executive Certificates, 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 police procedures and practices.
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