Find the Right Expert
for Every Case

Kerollos Shaker, MD, FACEP

Expert Toxicologist - Emergency Medicine Doctor

Kerollos Shaker, MD, FACEP is a toxicology and emergency medicine expert specializing in forensic toxicology and emergency medical toxicology litigation. With a career spanning emergency medicine, forensic pathology, and anatomic pathology, he brings a multidisciplinary perspective to his litigation work. His work centers on investigating toxicological impacts, assessing emergency medical interventions, and evaluating whether forensic standards were met. Dr. Shaker has been retained in numerous expert witness and consulting engagements across Texas and Florida, involving cases of accidental overdose, workplace exposure, and postmortem death analysis. His M.D. from the University of Alabama School of Medicine, along with medical licenses in Texas 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 causation in disputes involving medical toxicology and emergency medicine.

Andrew Patera, PhD

Biomedical Engineer

Andrew Patera, PhD is a Biomedical Engineering expert specializing in molecular diagnostics and biosensing technologies. With a career encompassing interdisciplinary research in materials chemistry, device fabrication, and computational chemistry, he brings a multifaceted approach to his litigation work. His work centers on investigating novel diagnostic methods, assessing biosensor efficacy, and evaluating the integration of molecular probes in clinical settings. Mr. Patera has been retained in numerous expert witness and consulting engagements across the United States, involving cases in the biomedical engineering and medical device industries. His PhD in Biomedical Engineering from SUNY Downstate, along with his Master of Arts in Chemistry from Johns Hopkins University, 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 biosensing and diagnostic technologies.

Moiz Khan, PhD

Expert Witness

Moiz Khan, PhD is an engineering and medical devices expert specializing in surgical and medical robotics litigation. With a career encompassing rehabilitation, simulation, and design, he brings a multidisciplinary framework to his litigation work. His work centers on investigating surgical robotics applications, assessing medical device compliance, and evaluating whether design strategies meet industry standards. Mr. Khan has been retained in numerous expert witness and consulting engagements across the United States, involving surgical robotics, medical device design, and artificial intelligence in healthcare. His PhD in Engineering from Columbia University, along with his MBA from Brown University and Post-Doctoral work at Harvard Medical School, 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 robotics and medical devices.

Dorian Kenleigh, MD, MPH, FACOEM, FIAIME

Expert Witness

Dorian Kenleigh, MD, MPH, FACOEM, FIAIME is an Occupational Medicine expert specializing in Independent Medical Examinations. With a career encompassing environmental toxicology, disability evaluation, and infectious disease, he brings a comprehensive framework to litigation involving occupational health and safety. His work centers on investigating occupational exposure, assessing impairment ratings, and evaluating whether industry standards have been met. Dr. Kenleigh has been retained in numerous expert witness and consulting engagements across various industries, involving cases related to occupational exposure, permanent impairment, and industrial hygiene. His MD from the University of Iowa and MPH from the University of Washington, along with certifications such as FACOEM and FIAIME, 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 occupational health and safety.

Boyle C. Cheng

Director, Neuroscience Institute

Boyle C. Cheng, PhD is a neurosurgery and biomechanics expert specializing in spine surgery and medical device litigation. With a career spanning mechanical engineering, neurosurgery, and biomechanics, he brings a multidisciplinary perspective to his litigation work. His work centers on investigating biomechanical failures, assessing surgical outcomes, and evaluating whether medical devices meet industry standards. Mr. Cheng has been retained in numerous expert witness and consulting engagements across the United States, involving neurosurgery, biomechanics, and spinal surgery cases. His Ph.D. in Mechanical Engineering, along with his extensive academic appointments, 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 spinal surgery and medical devices.

Julian Shields

Vocational Rehabilitation Consultant

Julian Shields, PhD, MS, BS is a vocational rehabilitation consultant expert specializing in personal injury and vocational assessments. With a career spanning vocational evaluations, labor market surveys, and transferable skills analysis, he brings a comprehensive understanding of vocational rehabilitation processes to litigation work. His work centers on investigating earning loss, assessing vocational maximum medical improvement, and evaluating whether job analysis aligns with industry standards. Mr. Shields has been retained in numerous expert witness and consulting engagements across the United States, involving personal injury, family law, and maritime cases. His PhD in Counselor Education and Supervision, along with his MS in Rehabilitation Counseling, reinforce his ability to deliver objective, defensible analyses. He is regularly engaged by both plaintiff and defense counsel to provide clear, independent determinations of earning capacity in disputes involving vocational rehabilitation.

Matthew F. Baretich, Ph.D., P.Eng., CCE, P.E.

Matthew F. Baretich, Ph.D., P.Eng., CCE, P.E. is a clinical engineering expert specializing in healthcare technology management and medical device safety. With a career spanning biomedical engineering, risk management, and hospital administration, he brings a multidisciplinary perspective to litigation work. His work centers on investigating medical device incidents, assessing compliance with healthcare standards, and evaluating whether risk management protocols were appropriately followed. Mr. Baretich has been retained in numerous expert witness and consulting engagements across North America, involving healthcare technology management and medical device safety cases. His Ph.D. in Hospital and Health Administration, along with certifications as a Certified Clinical Engineer (CCE) and Professional Engineer (P.Eng., P.E.), 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 clinical engineering and healthcare technology management.

Jerome Siegel, MD, MPH

Experienced Toxicology & Emergency Medicine Expert

Specializing in forensic toxicology, Jerome Siegel, MD, MPH, provides expert witness services through his role as Founder and President of AMFS (American Medical Forensic Specialists). With extensive experience in emergency medical toxicology and urgent care, he assesses causes of loss related to water poisoning, food poisoning, and substance abuse toxicology. As Medical Director at Rock Med, he coordinates medical coverage at large-scale events, ensuring comprehensive damage assessments in high-pressure environments. Dr. Siegel holds multi-state PE licensing, enhancing his capability to address complex cases across various jurisdictions.

Heath Jolliff, DO

Medical Toxicology and Forensics Expert

Heath Jolliff, DO is a medical toxicology and forensics expert specializing in forensic toxicology, drug abuse, and impairment cases. With a career spanning toxicology, emergency medical toxicology, and risk assessment, he brings a nuanced understanding of substance-related impairments and their implications in legal contexts. His work centers on investigating overdose incidents, assessing drug testing results, and evaluating whether impairment influenced behavior. Mr. Jolliff has been retained in numerous expert witness and consulting engagements across the United States, involving cases of DUI, drug abuse, and toxicology assessments. His DO from Ohio University-COM, along with active medical licenses in Colorado 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 causation in disputes involving marijuana, alcohol, and opioid-related impairments.

Lloyd A Marks, MD, MBS, FACC, FAIMBE

Expert Witness

Lloyd A Marks, MD, MBS, FACC, FAIMBE is a Medical Devices and Intellectual Property expert specializing in medical technology and patent-related litigation. With a career spanning medical device assessment, protection, and commercialization, he brings a comprehensive understanding of the intersection between medical innovation and intellectual property rights. His work centers on investigating patent validity, assessing medical device compliance, and evaluating whether commercialization strategies align with industry standards. Dr. Marks has been retained in numerous expert witness and consulting engagements across the United States, involving medical device and intellectual property disputes. His MD from the University of Michigan, along with his MBA from the University of Tennessee Knoxville and affiliations with the American College of Cardiology and the American Institute of Medical and Biological 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 responsibility in disputes involving medical technology and intellectual property.

Hospitals & Medical Services Experts

Expert Witness

Hospitals & Medical Services Experts is an expert witness specializing in complex claims and litigation across multiple domains. With a comprehensive approach to aligning top-tier experts, they bring a strategic and tactical framework to litigation work. Their work centers on investigating personal injury claims, assessing professional negligence and medical malpractice, and evaluating product liability cases. Hospitals & Medical Services Experts has been retained in numerous expert witness and consulting engagements across the U.S. and internationally, involving personal injury, professional negligence, and high-exposure claims. Their expertise in these areas, along with their ability to secure university-affiliated and private-practice experts, reinforces their ability to deliver objective, defensible analyses. They are regularly engaged by both plaintiff and defense counsel to provide clear, independent determinations of causation in disputes involving complex medical and legal intersections.

Michelle R Hoffman, MS

Expert Witness

Michelle R Hoffman, MS is a biomechanics and biomedical engineering expert specializing in injury analysis and causation. With a career spanning over three decades in forensic injury analysis, she brings a multidisciplinary perspective to litigation work involving complex injury mechanisms. Her work centers on investigating injury causation, assessing the biomechanics of accidents, and evaluating whether product liability standards were met. Ms. Hoffman has been retained in numerous expert witness and consulting engagements across the United States, involving motor vehicle accidents, child seat related injuries, and use of force incidents. Her MS in Biomedical Engineering from Arizona State University, along with her extensive experience, 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 injury mechanisms and product safety.

Sajel Lala Kana, MD

Expert Witness

Sajel Lala Kana, MD is a Medical Genetics expert specializing in DNA analysis and genetic counseling in the context of insurance and reinsurance litigation. With a career encompassing clinical genetics, metabolism, and pharmacogenomics, she brings a nuanced understanding of genetic disorders and their implications to her litigation work. Her work centers on investigating genetic causation, assessing the impact of inborn errors of metabolism, and evaluating whether genetic factors contribute to non-accidental trauma. Dr. Kana has been retained in numerous expert witness and consulting engagements across the United States, involving cases related to medical genetics, insurance disputes, and birth defects. Her MD from St. George’s University, along with her board certification in Genetics by the American Board of Medical Genetics and Genomics (ABMGG), 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 genomic medicine and genetic counseling.

Jeffrey Brown, PhD

Expert Witness

Jeffrey Brown, PhD is a products liability and biomedical engineering expert specializing in litigation involving medical devices and biologics. With a career spanning risk management, design history file analysis, and forensic science, he brings a multidisciplinary perspective to litigation work. His work centers on investigating product liability claims, assessing design controls, and evaluating whether regulatory standards have been met. Mr. Brown has been retained in numerous expert witness and consulting engagements across the United States, involving cases related to medical devices, biologics, and intellectual property. His PhD in Biomedical Engineering, along with his MS in Bioengineering, 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 product liability and biomedical engineering.

The Kupiec Group

Forensic & Laboratory Testing

The Kupiec Group is a forensic and laboratory testing expert specializing in forensic toxicology and chemistry. With a career encompassing forensic toxicology, pharmacology, and pharmaceutical sciences, they bring a multidisciplinary approach to litigation work. Their work centers on investigating drug interactions, assessing laboratory procedures, and evaluating whether testing standards have been met. The Kupiec Group has been retained in a substantial number of expert witness and consulting engagements across the United States, involving cases related to drugs of abuse, pharmaceutical compounding, and DUI/DWI/DUID. Their Ph.D. in Pharmaceutical Sciences, along with their M.Ed. in Chemistry Education and B.S. in Chemistry, reinforce their ability to deliver objective, defensible analyses. They are regularly engaged by both plaintiff and defense counsel to provide clear, independent determinations of causation in disputes involving drug potency, laboratory instrumentation, and human performance toxicology.

Michael L. Winzenread, M.D.

Michael L. Winzenread, M.D. is a Family Medicine and Legal Medicine expert specializing in legal, occupational, social security disability, and immigration evaluations. With a career encompassing diverse roles in family practice, legal medicine, and medical quality review, he brings a multifaceted perspective to his litigation work. His work centers on investigating medical causation, assessing standard of care, and evaluating responsibility in complex medical-legal disputes. Dr. Winzenread has been retained in numerous expert witness and consulting engagements throughout Oklahoma, involving family medicine, occupational health, and medical quality review cases. His M.D. from the University of Oklahoma College of Medicine, along with his Family Practice Board Certification — A.B.F.P., 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 medical malpractice and occupational health issues.

John K Murphy, JD, PA-C EFO

Fire and EMS Expert - Training and Response

John K Murphy, JD, PA-C EFO is a Fire and EMS expert specializing in training and response litigation. With a career encompassing fire administration, emergency medical services, and human resources, he brings a comprehensive framework to his litigation work. His work centers on investigating fire and EMS operations, assessing training program standards, and evaluating whether employment practices align with industry regulations. Mr. Murphy has been retained in numerous expert witness and consulting engagements across the United States, involving fire and EMS operations, human resources, and emergency response cases. His JD from Seattle University School of Law, along with certifications such as Physicians Assistant and Executive Fire 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 standard of care in disputes involving fire and EMS operations and training programs.

Eric Anttila, PhD

Medical Device Expert Witness

Eric Anttila, PhD is a medical device expert specializing in intellectual property litigation. With a career encompassing biomedical engineering, patent analysis, and medical imaging, he brings a multidisciplinary perspective to his litigation work. His work centers on investigating medical device failures, assessing patent validity, and evaluating whether industry standards in MRI safety and endovascular repair have been met. Mr. Anttila has been retained in numerous expert witness and consulting engagements across the United States, involving cases related to medical devices, intellectual property disputes, and cardiovascular disease. His PhD in Biomedical Engineering, along with his expertise in ISO 13485 and mechanical 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 medical device testing and failure analysis.