Impairment Expert Witnesses
Impairment expert witnesses and consultants listed here may be able to form expert opinions, draft expert witness reports, provide expert witness testimony at deposition and/or trial as or serve as consulting (non-testifying) experts on impairment. The impairment expert witness listings on this page are typically from fields/areas of expertise such as: Addiction Medicine, Cannabis, Disability Evaluation, Emergency Medical Toxicology, Emergency Medicine, Family Medicine, Forensic Psychology, Life Care Planning, Neuropsychology, Occupational Medicine, Ophthalmology, Optometry, Orthopedic Surgery, Orthopedics - Non-Surgical, and Pain Management - Medicine.
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Christine E. Valdez, Ph.D., ABPP
Forensic Psychologist – Trauma & PTSD
Walnut Creek, California
Psychology, Forensic Psychology
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forensic psychologist, psychological injury, PTSD evaluation, trauma assessment, interpersonal violence, IME, personal injury, sexual harassment, expert witness, record review, rebuttal expert, causation, impairment, malingering, symptom validity, workplace trauma, disability evaluation, trauma expert, VA disability, trauma disorder
Christine E. Valdez, Ph.D., ABPP is a California licensed clinical psychologist and board-certified in clinical psychology. She specializes in forensic psychology and is retained in civil litigation to provide forensic psychological evaluation and consultation in cases involving trauma, PTSD, interpersonal violence, and psychological injury.
Dr. Valdez has conducted over 1,000 forensic evaluations through her work with the U.S. Department of Veterans Affairs, including disability and compensation-related assessments. Her evaluations address diagnosis, causation, and functional impairment and are grounded in both clinical expertise and research in traumatic stress.
Dr. Valdez is a Professor of Clinical Psychology at California State University, Monterey Bay, where she teaches psychopathology and advanced research methods and trains clinicians in assessment and diagnosis. She has authored over 25 peer-reviewed publications and delivered more than 50 professional presentations on tra...
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Barry E. Breaux, Sr., M.D.
Experienced Ophthalmology Witness & Consultant
Expedient Medicolegal Services
Pinole, California
Ophthalmology, Optometry
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Vision Loss, Impairment, Standard of Care, Traumatic Injury, Retina Injury, Disability, Surgical Complications, Surgical Center Management, Eye Strain, Blurred Vision, Foreign Bodies, Reduced Nighttime Vision, Cornea Injury, Vision Loss from Medical Complications, Infections
Dr. Barry E. Breaux, Sr. is a board-certified ophthalmologist with over 35 years of experience in both medical and surgical ophthalmology. He completed his undergraduate studies in Chemistry at the University of Kansas before earning his medical degree from Columbia University College of Physicians and Surgeons. Following his medical training, Dr. Breaux pursued an internal medicine internship and an ophthalmology residency at Martin Luther King, Jr. General Hospital in Los Angeles, California, later completing a fellowship in Refractive Keratoplasty at Holy Cross Hospital under Dr. Richard Villasenor.
Dr. Breaux has spent the majority of his career practicing in the San Francisco Bay Area, where he has held numerous professional and academic positions. He has served as an Instructor for the American Academy of Ophthalmology and has been an Adjunct Assistant Clinical Professor at Touro University College of Osteopathic Medicine. His contributions to the field include roles such as ...
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David A Granovetter, MD
Addiction Medicine & Impaired Physician Expert
David Alan Granovetter MD, Inc. A Professional Corporation
San Jose, California
Addiction Medicine
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Addiction Medicine, Expert witness, Substance use disorder, Standard of care, MAT, Relapse, Impairment, Impaired practitioner, Fitness for duty, Physician impairment, Safety sensitive professionals, Medical board cases, Licensing matters, Credentialing disputes, Return to work, Alcohol use disorder, Medical Staff matters
David A. Granovetter, MD, FASAM is a board-certified Addiction Medicine physician who provides independent expert witness services and medico-legal consultation in matters involving addiction medicine, substance use disorders, physician impairment, and fitness-for-duty determinations.
Dr. Granovetter has over 20 years of experience in Addiction Medicine, including extensive work in physician health, impairment assessment, and physician well-being leadership. His professional background includes clinical addiction medicine practice as well as long-standing leadership roles focused on the evaluation and management of impairment in safety-sensitive professionals, particularly physicians.
He is a Fellow of the American Society of Addiction Medicine (FASAM) and a Diplomate of the American Board of Addiction Medicine. He is also a Certified Medical Review Officer (MRO). Dr. Granovetter has significant experience applying accepted medical standards to questions of diagnosis, functional i...
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Shawn A Hayden, MD, PhD, MBA
Harvard Trained Orthopedic Spine/Trauma Surgeon
Shawn A. Hayden MD PA
California
Spine Surgery & Spine Care, Orthopedic Surgery
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Orthopedic Surgery, Spine Surgery, Sports Medicine and Surgery, Endoscopic Surgery, Minimally Invasive Surgery, Sports Injury, Back Injury, Neck Injury, Whiplash, Concussion, Causation, Case Valuation, Impairment, Medical Devices, Innovation, Understanding EMR, Vehicle Injury Evaluation, Trauma
Dr. Hayden graduated from Harvard College. He received his medical degree from the University of Massachusetts Medical School and his orthopedic training at the Harvard Combined Orthopedics Residency Program. He has been providing high quality medical expert opinions on orthopedic surgical spine and trauma care for years.
Dr. Hayden is also fellowship trained in orthopedic trauma and spine surgery at The Massachusetts General Hospital and The Beth Israel Deaconess Medical Center.
Diplomate of the American Board of Orthopedic Surgery and a Fellow in the American Academy of Orthopedic Surgeons. Dr. Hayden is board certified in Orthopedic Surgery. His Ph.D was received at the UT Southwestern Medical Center with research in computer science and anatomy. In 2011, Dr. Hayden received his MBA from the University of Tennessee.
Today Dr. Hayden runs Onto Orthopedics, a high quality private orthopedic medical practice in Plano, TX. Dr. Hayden’s focus has always been in providing high-tec...
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Arnold J. Weil, MD
Pain Management / Orthopedic Medical Expert
Non-Surgical Orthopaedics
Coral Gables, Florida
Pain Management - Medicine, Orthopedics - Non-Surgical
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Non-Surgical oOrthopedics, Pain Management, Back Pain, Spinal Injections, Musculoskeletal, Disability, Peer Review, PM&R, Spine Care, Neck Pain, Case Reviews, Depositions, Trial Testimony, Impairment, Plaintiff & Defense, Research
Arnold J. Weil, M.D. founded Non-Surgical Orthopaedics, P.C. in 1993 and has served as its Chief Executive Officer for more than 30 years, in addition to his work in healthcare consulting and as a medical expert witness. A Diplomate of the American Board of Physical Medicine and Rehabilitation, Dr. Weil has established both himself and Non-Surgical Orthopaedics as among the premier orthopaedic and spine care and pain management practices in the metro Atlanta area.
An active lecturer, Dr. Weil speaks nationally and internationally on the nonsurgical management of back and neck pain, as well as emerging advances in pain management.
As a clinical practitioner in Atlanta, Georgia, Dr. Weil developed a comprehensive medical center that includes patient care services, a clinical research facility, diagnostic imaging and MRI, and an outpatient surgical center for interventional spine procedures. Under his leadership, the practice has expanded to include multiple physicians and healthcare...
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Jesse Hatgis, D.O.
Pain/PM&R Physician- Double Board Certified
Interventional Spine Specialists of Florida
Parkland, Florida
Pain Management - Medicine, Physical Medicine & Rehab
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Expert witness, Catastrophic injury, Non-catastrophic injury, Medical malpractice, Spinal injury, Spinal fractures, Complex Regional Pain Syndrome, Back pain, Neck pain, Spinal cord stimulation, Radiofrequency Ablation, Kyphoplasty, Discectomy, Epidurals, Headaches, Opioids, Impairment, Pain management, Spinal injections, Wrongful death
Dr. Jesse Hatgis, D.O. is a double board certified osteopathic pain management/ physical medicine and rehabilitation physician. As an interventional pain physician, Dr. Hatgis utilizes a variety of advanced therapies including, but not limited to, spinal cord stimulation, peripheral nerve stimulation, kyphoplasty, endoscopic rhizotomy, endoscopic/microdiscectomy, tumor ablation, radiofrequency ablation, interspinous process device placement, facet joint stabilization, sacroiliac joint fusion, minimally invasive lumbar decompression (MILD procedure), stellate ganglion blocks, nerve blocks, joint injections, and regenerative medicine.
Dr. Hatgis has authored and peer-reviewed numerous publications in various medical literature resources, specifically on sacral insufficiency and vertebral compression fractures, vertebral augmentation, original uses of Cortoss cement, Baastrup’s disease, percutaneous cervical discectomies, cauda equina syndrome, and innovative techniques for the usage ...
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Dr. David H. Schaffer, MD, MRO
Toxicology Director, Experienced Witness, Dual BC
Florida
Toxicology, Emergency Medicine
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Drug Testing, Toxicology, Overdose, Drug Levels, Chemical Exposure, Alcohol, Fentanyl, Carbon Monoxide, Poisoning, Opioids, Med Mal, Medical Toxicology, Marijuana, Impairment, Methamphetamine, Opiates, Child Custody, Drugs, Toxic Tort, Hair Testing
Dr. David H. Schaffer, MD, MRO is dual-boarded in both Medical Toxicology and Emergency Medicine, serving as the Director of Medical Toxicology at the University of South Carolina School of Medicine in Greenville, SC and Prisma Health–Upstate hospitals. He is also a certified Medical Review Officer (MRO, MROCC). Dr. Schaffer has published extensively in the fields of Medical Toxicology and Emergency Medicine. Outside of clinical practice and the occasional courtroom appearance, Dr. Schaffer has also consulted for major organizations—including SpaceX, Butterfly Network, and governmental entities—on a variety of clinical matters.
Dr. Schaffer earned his medical degree from the University of North Carolina School of Medicine, completed his residency at Harvard, where he served as a Clinical Fellow at Harvard Medical School, and subsequently trained in Medical Toxicology at the University of Virginia. He is a practicing physician with extensive publications and speaking records, is reg...
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Shawn A Hayden, MD, PhD, MBA
Harvard Trained Orthopedic Spine/Trauma Surgeon
Shawn A. Hayden MD PA
Florida
Spine Surgery & Spine Care, Orthopedic Surgery
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Orthopedic Surgery, Spine Surgery, Sports Medicine and Surgery, Endoscopic Surgery, Minimally Invasive Surgery, Sports Injury, Back Injury, Neck Injury, Whiplash, Concussion, Causation, Case Valuation, Impairment, Medical Devices, Innovation, Understanding EMR, Vehicle Injury Evaluation, Trauma
Dr. Hayden graduated from Harvard College. He received his medical degree from the University of Massachusetts Medical School and his orthopedic training at the Harvard Combined Orthopedics Residency Program. He has been providing high quality medical expert opinions on orthopedic surgical spine and trauma care for years.
Dr. Hayden is also fellowship trained in orthopedic trauma and spine surgery at The Massachusetts General Hospital and The Beth Israel Deaconess Medical Center.
Diplomate of the American Board of Orthopedic Surgery and a Fellow in the American Academy of Orthopedic Surgeons. Dr. Hayden is board certified in Orthopedic Surgery. His Ph.D was received at the UT Southwestern Medical Center with research in computer science and anatomy. In 2011, Dr. Hayden received his MBA from the University of Tennessee.
Today Dr. Hayden runs Onto Orthopedics, a high quality private orthopedic medical practice in Plano, TX. Dr. Hayden’s focus has always been in providing high-tec...
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David A. Libert, MD
Family Practice Physician
First Choice Medical Center
Maitland, Florida
Family Medicine
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Soft tissue injuries, IME training: ACOEM, motor vehicle injuries, medical record review, independent medical evaluation, medical malpractice, personal injury, Standard of Care Review, Opinions as to causation, impairment, medical care and treatment
David Libert, M.D. Has been a practicing family physician since 1985. He has held positions of team physician, practicing physician, and medical director. He has extensive experience in family practice and disability medicine. He has been an expert witness for both plaintiff and defense medical legal cases. He is experienced in diagnosing and treating injuries from motor vehicle accidents and sports activities. He can provide an opinion as to causation, impairment, and medical care and treatment on a case.
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Shawn A Hayden, MD, PhD, MBA
Harvard Trained Orthopedic Spine/Trauma Surgeon
Shawn A. Hayden MD PA
Georgia
Spine Surgery & Spine Care, Orthopedic Surgery
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Orthopedic Surgery, Spine Surgery, Sports Medicine and Surgery, Endoscopic Surgery, Minimally Invasive Surgery, Sports Injury, Back Injury, Neck Injury, Whiplash, Concussion, Causation, Case Valuation, Impairment, Medical Devices, Innovation, Understanding EMR, Vehicle Injury Evaluation, Trauma
Dr. Hayden graduated from Harvard College. He received his medical degree from the University of Massachusetts Medical School and his orthopedic training at the Harvard Combined Orthopedics Residency Program. He has been providing high quality medical expert opinions on orthopedic surgical spine and trauma care for years.
Dr. Hayden is also fellowship trained in orthopedic trauma and spine surgery at The Massachusetts General Hospital and The Beth Israel Deaconess Medical Center.
Diplomate of the American Board of Orthopedic Surgery and a Fellow in the American Academy of Orthopedic Surgeons. Dr. Hayden is board certified in Orthopedic Surgery. His Ph.D was received at the UT Southwestern Medical Center with research in computer science and anatomy. In 2011, Dr. Hayden received his MBA from the University of Tennessee.
Today Dr. Hayden runs Onto Orthopedics, a high quality private orthopedic medical practice in Plano, TX. Dr. Hayden’s focus has always been in providing high-tec...
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Arnold J. Weil, MD
Pain Management / Orthopedic Medical Expert
Non-Surgical Orthopaedics
Georgia
Pain Management - Medicine, Orthopedics - Non-Surgical
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Non-Surgical oOrthopedics, Pain Management, Back Pain, Spinal Injections, Musculoskeletal, Disability, Peer Review, PM&R, Spine Care, Neck Pain, Case Reviews, Depositions, Trial Testimony, Impairment, Plaintiff & Defense, Research
Arnold J. Weil, M.D. founded Non-Surgical Orthopaedics, P.C. in 1993 and has served as its Chief Executive Officer for more than 30 years, in addition to his work in healthcare consulting and as a medical expert witness. A Diplomate of the American Board of Physical Medicine and Rehabilitation, Dr. Weil has established both himself and Non-Surgical Orthopaedics as among the premier orthopaedic and spine care and pain management practices in the metro Atlanta area.
An active lecturer, Dr. Weil speaks nationally and internationally on the nonsurgical management of back and neck pain, as well as emerging advances in pain management.
As a clinical practitioner in Atlanta, Georgia, Dr. Weil developed a comprehensive medical center that includes patient care services, a clinical research facility, diagnostic imaging and MRI, and an outpatient surgical center for interventional spine procedures. Under his leadership, the practice has expanded to include multiple physicians and healthcare...
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Steve Allison, DPT, CME
Functional Capacity & PT Malpractice Expert -30+yr
Functional Capacity Experts, LLC
Bossier City, Louisiana
Physical Therapy, Disability Evaluation
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Functional Capacity Evaluation, FCE, physical therapy, impairment, disability, functional limitation, activities of daily living, loss of enjoyment of life activities, performance validity, pain behavior, motor vehicle accident, work injury, medical malpractice, fitness-for-duty, nursing home, fall, nursing home, home health
Dr. Allison is CEO and managing partner of Functional Capacity Experts, LLC and Disability Management Group, LLC. He is a doctor of physical therapy and certified DOT medical examiner. Licensed to practice in Louisiana since 1993. He has 24 years of clinical practice experience specializing in functional capacity evaluations (FCEs) for cases involving personal injury, workers' compensation, long term disability, and Social Security disability claims. He has performed more than 5,000 FCEs to more objectively quantify and qualify the severity of an individual's occupational disability, credibility of pain behavior, physical impairments with participation in basic activities of daily living, and loss of enjoyment of life activities.
Dr. Allison was the lead author of the Functional Capacity Evaluation Best Practice Guidelines adopted by the American Physical Therapy Association in 2018. He was also an author of the Functional Capacity Evaluation and Disability Determination monogra...
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Justin (Chih Chao) Yang, MD, MPH, FACP, FACOEM, FASAM
Triple Board Certified Harvard Occ Med Professor
Harvard TH Chan Shool of Public Health
Boston, Massachusetts
Occupational Medicine, Addiction Medicine
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Fitness for Duty, Return to Work, Workers' Compensation, Occupational Exposure, Occupational Causation, Exposure Assessment, Toxic Exposure, Chemical Exposure, Infectious Disease Exposure, IME, Work-Relatedness, Disability, Impairment, Drug Testing, Substance Abuse, Alcohol Use Disorder, Workplace Burnout, COVID-19, Chronic Pain
Justin Yang, MD, MPH, FACP, FACOEM, FASAM, is an academic occupational and environmental medicine physician with faculty and leadership appointments at Harvard and Boston University. He serves as Associate Program Director of the Harvard Occupational and Environmental Medicine Residency Program and as Adjunct Assistant Professor in Environmental Health at Harvard T.H. Chan School of Public Health. He is also an Assistant Professor of Medicine at Boston University School of Medicine.
Dr. Yang brings a distinctive combination of academic medicine, clinical practice, occupational health leadership, and public-health expertise. He completed his MPH at Harvard, internal medicine residency at Boston Medical Center- Brighton and occupational and environmental medicine residency at Harvard T.H. Chan School of Public Health. He is triple board certified in Occupational Medicine, Internal Medicine, and Addiction Medicine, and is a Fellow of the American College of Physicians, the American Co...
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Robert B Swotinsky, MD, MPH
Drug and alcohol testing and impairment.
Sudbury, Massachusetts
Occupational Medicine, Toxicology
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Drug testing, drug test, drug screening, drug screen, alcohol testing, alcohol test, toxicology, medical review officer, MRO, impairment, disability, DOT physicals, DOT exams, occupational medicine, occupational health, truck driver, dram shop, alcohol, workers compensation
Expert in drug and alcohol testing and impairment, fitness-for-duty, and occupational medicine. Extensive experience in cases involving drug and alcohol testing in the workplace and in other settings; dram shop cases; fitness of police and firefighters, commercial drivers, and other workers; and disability discrimination. Clear, detailed, well-organized, well-referenced, and timely reports. Qualifications include: board certified in occupational medicine. Certified medical review officer (MRO), FMCSA (NRCME) Medical Examiner and trainer, and (former) FAA Medical Examiner. Fellow of American College of Occupational and Environmental Medicine (ACOEM) and awarded the 2018 ACOEM Achievement in Occupational Medicine Award. Assistant Professor, U Mass Medical School. Former residency director for occupational medicine training program. Written books and written/given numerous educational programs to physician and other groups about drug and alcohol testing, and about DOT physicals (...
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David Haustein, MD, MBA, CLCP, CPLCP
Certified physician life care planner, CLCP, CPLCP
Expert Medical Consulting
Springfield, Missouri
Physical Medicine & Rehab, Life Care Planning
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Life Care Planning (LCP), Electrodiagnosic Medicine, Neuropathy, Amputations, Musculoskeletal, Neurologic, Orthopedic, Rehabilitation, Physiatry, EMG, Medicolegal Review, IME, Chart Review, Radiculopathies, Certified Physician Life Care Planner, Amputee, Disability, Impairment, Expert Opinion
Dr. David Haustein is a senior academic physician specializing in Physical Medicine and Rehabilitation (PM&R) and has practiced medicine since 2009. He is board-certified in PM&R with additional certifications in neuromuscular medicine and electrodiagnostic medicine and is a Certified Life Care Planner and Certified Physician Life Care Planner. Dr. Haustein provides record reviews, medical examinations, and written opinions, including life care plans, life care plan reviews, and medical cost projections. Dr. Haustein’s clinical experience includes the evaluation and management of individuals with complex and catastrophic injuries, including traumatic brain injury, spinal cord injury, amputations, and severe neurologic and orthopedic conditions. Dr. Haustein serves as an Associate Dean and Professor at the University of Missouri School of Medicine, maintains an active clinical electrodiagnostic practice, and has an extensive record of scholarship and invited regional and national pre...
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Niraj Govil, MD, MPH
SENIOR RANKING PHYSICIAN, USAF, TRIPLE BOARD CERT
Manalapan, New Jersey
Telemedicine, Family Medicine
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Aerospace medicine, aviation medicine, occupational medicine, fitness for air travel, disability evaluations, impairment evaluation, workplace injuries, return to work, fitness for duty, impairment, family medicine, urgent care
Dr. Govil is a licensed physician in active practice with over 20 years experience. He currently serves as a Senior Ranking Physician for the United States Air Force. Dr. Govil is triple board certified in Family Medicine, Aerospace Medicine, and Occupational Medicine. He holds an MPH from Rutgers Unviersity/John’s Hopkins University School of Public Health.
Dr. Govil previously worked as a family physician in private practice, caring for a diverse patient population. He continues to work in an urgent care community setting. He also provides telemedicine care in the specialty of family practice.
Dr. Govil has significant teaching experience, and serves a faculty member in the United States Air Force School of Aerospace Medicine.
Dr. Govil has extensive experience evaluating and opining on workplace injury, disability, and occupational injury cases. He has been called upon to express opinions on disability evaluations, patient impairment, workplace injuries, and fitness for...
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Barbara Kapetanakes, Psy.D.
Neuropsych Expert Witness w Masters in Psychopharm
Expedient Medicolegal Services
Sleep Hollow, New York
Neuropsychology, Psychology
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Trauma, Traumatic Injury, Cognitive Functioning, Impairment, Standard of Care, Mood Changes, PTSD, Education Standards, Disability Evaluation, Functional Capacity, Developmental Delays, Psychoeducational Evaluation, Attention Deficits, Executive Functioning, Memory Loss, Brain Injury
Dr. Barbara Kapetanakes is a New York State Licensed Psychologist with over 25 years of experience in clinical practice, with a specialty in neuropsychology as well as general practice. She holds a Doctorate in Psychology and a Master’s in Education in School Psychology, both from Pace University, and has further advanced her expertise with a Post-Doctoral Certificate in Neuropsychology from the Fielding Institute and a Post-Doctoral Master’s Degree in Psychopharmacology from Fairleigh Dickinson University.
Dr. Kapetanakes is the founder and director of a thriving private practice in Sleepy Hollow, NY, where she provides comprehensive psychological services, including neuropsychological testing, psychodynamic psychotherapy, and divorce mediation. Her practice focuses on adolescents, families navigating divorce, and individuals with learning disabilities, attention deficits, traumatic brain injuries, and other neurocognitive disorders. She also offers support for patients dealing wi...
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Heath Jolliff, DO
Medical Toxicology and Forensics Expert
Mid-Ohio Toxicology Services, LLC
Columbus, Ohio
Toxicology, Emergency Medical Toxicology
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Forensic toxicology, Drug Abuse, Overdose, Impairment, Marijuana, Alcohol, Drug testing, DUI, Risk assessment, Cannabis, Opioids
Board Certified in Emergency Medicine and Medical Toxicology.
Fellowship trained at the University of Colorado/Rocky Mountian Poison and Drug Center.
Over 3 decades of clinical experience.
Expert forensics work for over 2 decades
Active Medical License in Colorado and Ohio
Fellow, American College of Medical Toxicology
Previous, Medical Toxicology Fellowship Program Director
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Shawn A Hayden, MD, PhD, MBA
Harvard Trained Orthopedic Spine/Trauma Surgeon
Shawn A. Hayden MD PA
Ohio
Spine Surgery & Spine Care, Orthopedic Surgery
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Orthopedic Surgery, Spine Surgery, Sports Medicine and Surgery, Endoscopic Surgery, Minimally Invasive Surgery, Sports Injury, Back Injury, Neck Injury, Whiplash, Concussion, Causation, Case Valuation, Impairment, Medical Devices, Innovation, Understanding EMR, Vehicle Injury Evaluation, Trauma
Dr. Hayden graduated from Harvard College. He received his medical degree from the University of Massachusetts Medical School and his orthopedic training at the Harvard Combined Orthopedics Residency Program. He has been providing high quality medical expert opinions on orthopedic surgical spine and trauma care for years.
Dr. Hayden is also fellowship trained in orthopedic trauma and spine surgery at The Massachusetts General Hospital and The Beth Israel Deaconess Medical Center.
Diplomate of the American Board of Orthopedic Surgery and a Fellow in the American Academy of Orthopedic Surgeons. Dr. Hayden is board certified in Orthopedic Surgery. His Ph.D was received at the UT Southwestern Medical Center with research in computer science and anatomy. In 2011, Dr. Hayden received his MBA from the University of Tennessee.
Today Dr. Hayden runs Onto Orthopedics, a high quality private orthopedic medical practice in Plano, TX. Dr. Hayden’s focus has always been in providing high-tec...
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Nina M. French
Workplace Drug Testing and Cannabis Expert
Capwell Consulting Group
Meadowbrook, Pennsylvania
Substance Abuse, Cannabis
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Employment Drug Testing, Workplace Safety, DOT Compliance, Drug Testing Regulations, Cannabis Testing, Occupational Health, Urinalysis, Alcohol Testing, Oral Fluid Testing, SAMHSA Compliance, Substance Testing Regs, Drug Lab Analysis, State Cannabis Regulations, Drug Testing Laws, Impairment, Saliva Testing, Marijuana, Drug Screen
Leading substance abuse industry drug and alcohol testing authority with over 30 years of industry experience, serving as an expert witness, litigation consultant, and policy advisor in matters involving workplace drug testing, impairment assessment, and regulatory compliance. Proven expertise in federal regulations and state drug testing law, including DOT, SAMHSA, ADA, cannabis, and state-specific laws. Extensive background in designing compliant, defensible testing programs, and providing authoritative opinions involving wrongful termination, discrimination, and workplace safety claims. Skilled in translating complex scientific, regulatory, and operational issues into clear, court-ready testimony. Nina is a frequent presenter and author as a workplace safety and drug testing expert. Ms. French has served as the past President of the Drug & Alcohol Testing Association (DATIA) and is currently a member of the Scientific Advisory Board of the Impairment Science Organization (DRUID).
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Allison A. Muller, PharmD, DABAT, FAACT, AFACMT
Board-Certified Toxicologist - Penn/CHOP Faculty
Acri Muller Consulting, LLC
Aston, Pennsylvania
Toxicology, Pharmacology- Clinical
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opioids, carbon monoxide, marijuana, cannabis, impairment, DUI, drugs, medication errors, overdose, postmortem, toxicity, medications, drug testing, adverse event, dietary supplement, kratom, fentanyl, oxycodone, lithium, mold
Board-certified toxicologist. Fellow of the American Academy of Clinical Toxicology. Affiliate Fellow of the American College of Medical Toxicology. Registered pharmacist. Over 30 years of experience in the field of clinical toxicology.
Two decades as a clinical toxicologist and managing director at the Poison Control Center at The Children’s Hospital of Philadelphia (CHOP), consulting on toxicology cases from 21 counties in Pennsylvania and Delaware.
Expert witness experience has involved cases related to alcohol, drugs of abuse (ie, opioids, marijuana, synthetic cannabinoids, cocaine), carbon monoxide, medication errors, and postmortem toxicology.
Extensive teaching experience including as faculty at the University of Pennsylvania School of Veterinary Medicine.
*Please note that I am only able to work on cases with licensed attorneys.
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Dr. David H. Schaffer, MD, MRO
Toxicology Director, Experienced Witness, Dual BC
Greenville, South Carolina
Toxicology, Emergency Medicine
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Drug Testing, Toxicology, Overdose, Drug Levels, Chemical Exposure, Alcohol, Fentanyl, Carbon Monoxide, Poisoning, Opioids, Med Mal, Medical Toxicology, Marijuana, Impairment, Methamphetamine, Opiates, Child Custody, Drugs, Toxic Tort, Hair Testing
Dr. David H. Schaffer, MD, MRO is dual-boarded in both Medical Toxicology and Emergency Medicine, serving as the Director of Medical Toxicology at the University of South Carolina School of Medicine in Greenville, SC and Prisma Health–Upstate hospitals. He is also a certified Medical Review Officer (MRO, MROCC). Dr. Schaffer has published extensively in the fields of Medical Toxicology and Emergency Medicine. Outside of clinical practice and the occasional courtroom appearance, Dr. Schaffer has also consulted for major organizations—including SpaceX, Butterfly Network, and governmental entities—on a variety of clinical matters.
Dr. Schaffer earned his medical degree from the University of North Carolina School of Medicine, completed his residency at Harvard, where he served as a Clinical Fellow at Harvard Medical School, and subsequently trained in Medical Toxicology at the University of Virginia. He is a practicing physician with extensive publications and speaking records, is reg...
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Shawn A Hayden, MD, PhD, MBA
Harvard Trained Orthopedic Spine/Trauma Surgeon
Shawn A. Hayden MD PA
Plano, Texas
Spine Surgery & Spine Care, Orthopedic Surgery
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Orthopedic Surgery, Spine Surgery, Sports Medicine and Surgery, Endoscopic Surgery, Minimally Invasive Surgery, Sports Injury, Back Injury, Neck Injury, Whiplash, Concussion, Causation, Case Valuation, Impairment, Medical Devices, Innovation, Understanding EMR, Vehicle Injury Evaluation, Trauma
Dr. Hayden graduated from Harvard College. He received his medical degree from the University of Massachusetts Medical School and his orthopedic training at the Harvard Combined Orthopedics Residency Program. He has been providing high quality medical expert opinions on orthopedic surgical spine and trauma care for years.
Dr. Hayden is also fellowship trained in orthopedic trauma and spine surgery at The Massachusetts General Hospital and The Beth Israel Deaconess Medical Center.
Diplomate of the American Board of Orthopedic Surgery and a Fellow in the American Academy of Orthopedic Surgeons. Dr. Hayden is board certified in Orthopedic Surgery. His Ph.D was received at the UT Southwestern Medical Center with research in computer science and anatomy. In 2011, Dr. Hayden received his MBA from the University of Tennessee.
Today Dr. Hayden runs Onto Orthopedics, a high quality private orthopedic medical practice in Plano, TX. Dr. Hayden’s focus has always been in providing high-tec...
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Jennifer E Souders, MD
Souders Independent Medical Consultations PLLC
Seattle, Washington
Pain Management - Medicine, Addiction Medicine
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toxicology, impairment, prescription, drugs, opioids, cannabis/marijuana, alcohol, criminal, DUI/DWI, felony, civil, personal injury, dram shop, overdose
I am a physician (M.D.) who is Board Certified in Anesthesiology, Pain Medicine, and Addiction Medicine. As a consultant in forensic/legal cases, my main area of focus involves the clinical toxicology of prescription medications, recreational drugs and substances of abuse, marijuana/cannabis, and alcohol. My training and education include the interpretation of clinical and forensic toxicology test results in multiple matrices, including blood, urine, serum, hair, and nails. In addition, my training and education include safe opioid prescribing procedures, interpretation of prescribing records, assessment of patient responses to prescribed opioids, and overdose prevention education and practices.
Unlike non-physicians who review toxicology test results in forensic cases, as a clinician I am able to read, interpret, and testify on the contents of medical records. I understand that the presence of a positive test result does not necessarily constitute the presence of impairment or obs...
