Environmental Toxicology Expert Witnesses

Phoenix, Arizona

Toxicology, Neuropathology - neurotoxicology, Parkinson's, pesticides, heavy metals, environmental toxicology, neurological disease, neuropathology, drugs of abuse, neurodegeneration, neuroinflammation, toxicology

Dr. Ronald Tjalkens, Ph.D., is a Professor of Neurology and Translational Neuroscience with over 25 years of NIH-funded research experience in Neurotoxicology investigating the molecular and cellular mechanisms of neuroinflammation and its role in the progression of neurodegenerative disorders, including Parkinson’s disease and Alzheimer’s disease. His expertise spans neurotoxicology, neuropharmacology, and the effects of environmental exposures—such as heavy metals, pesticides, neurotropic viruses, and pharmacologic agents—on the nervous system. He has extensive experience using translational models of neurodegeneration, advanced imaging techniques, and AI-based image analysis to evaluate neuroinflammatory injury and identify therapeutic targets in glial cells. Dr. Tjalkens has served as an expert witness in both civil and criminal cases involving neurotoxic injury, providing testimony on causation and mechanisms of neurological damage, and brings an internationally recognized reco...

Phoenix, Arizona

Occupational Medicine, Independent Medical Examinations - Environmental Toxicology, Disability Evaluation, COVID, AMA Guides, Firefighters, Occupational Exposure, Peer Review, Infectious Disease, Permanent Imapirment, Police, Independent Medical Examinations, Veteran Examination, Musculoskeletal Injury Rehab, Impairment Rating, Utilization Review, Industrial Hygeine, Chart Review, MMI, OSHA

California

Toxicology, Occupational Medicine - Lead poisoning, cannabis, drug testing, alcohol, marijuana, environmental toxicology, occupational toxicology, arsenic poisoning, forensic toxicology, DUI, risk assessment, aviation toxicology, medical monitoring, risk communication, heavy metals, environmental health, public health, carbon monoxide, occupational cancer, fire toxicology

2016 Recipient of the American College of Medical Toxicology Matthew J. Ellenhorn Award [career achievement award in recognition of “extraordinary contributions to the field of medical toxicology”] Diplomate, American Boards of Internal Medicine, Preventive Medicine (Occupational Medicine), and Medical Toxicology Distinguished Fellow of the American College of Medical Toxicology (DFACMT) Active Medical Licensure in Colorado and California Professional activities have included: • Past President, American College of Medical Toxicology • Committee on Toxicology of the National Academy of Sciences • NIOSH Board of Scientific Counselors • CDC Advisory Committee on Childhood Lead Poisoning Prevention • EPA Science Advisory Board panels (lead in air, water, dust) • ATSDR expert panels (lead biomonitoring, hair analysis) • WHO consultant and temporary advisor (arsenic in drinking water, chelation of heavy metals) • Consultant to US Air Force Science Advisory Board (F-22) • Consultant to the...

Denver, Colorado

Toxicology, Occupational Medicine - Lead poisoning, cannabis, drug testing, alcohol, marijuana, environmental toxicology, occupational toxicology, arsenic poisoning, forensic toxicology, DUI, risk assessment, aviation toxicology, medical monitoring, risk communication, heavy metals, environmental health, public health, carbon monoxide, occupational cancer, fire toxicology

2016 Recipient of the American College of Medical Toxicology Matthew J. Ellenhorn Award [career achievement award in recognition of “extraordinary contributions to the field of medical toxicology”] Diplomate, American Boards of Internal Medicine, Preventive Medicine (Occupational Medicine), and Medical Toxicology Distinguished Fellow of the American College of Medical Toxicology (DFACMT) Active Medical Licensure in Colorado and California Professional activities have included: • Past President, American College of Medical Toxicology • Committee on Toxicology of the National Academy of Sciences • NIOSH Board of Scientific Counselors • CDC Advisory Committee on Childhood Lead Poisoning Prevention • EPA Science Advisory Board panels (lead in air, water, dust) • ATSDR expert panels (lead biomonitoring, hair analysis) • WHO consultant and temporary advisor (arsenic in drinking water, chelation of heavy metals) • Consultant to US Air Force Science Advisory Board (F-22) • Consultant to the...

Miami, Florida

Emergency Medicine, Toxicology - Emergency Medical Toxicology, Water Poisoning, Medical Toxicology, Public Health, Trauma, Forensic Toxicology, Diet and Disease, Urgent Care, Occupational Toxicology, Food Poisoning, Environmental Toxicology, Substance Abuse Toxicology

Dr. Gustin has had extensive education, training, and experience as a medical case reviewer and expert witness. He has personally evaluated and analyzed thousands of civil and criminal medical cases for both plaintiff and defendant, and is highly recommended by defense and plaintiff attorneys in civil and criminal actions. Dr. Gustin graduated from the University of Vermont magna cum laude, obtained a Master's degree in Nutrition, Biochemistry, and Metabolism from Goddard College, went to medical school at George Washington University in Washington DC where he distinguished himself as the President of the American Medical Student Association's section on Nutrition, Health Maintenance, and Disease Prevention. He also won the prestigious Joseph Goldberger Scholarship in Cardiology to the National Institutes of Health. After graduation, Dr. Gustin completed his Internship at the University of California, San Francisco (Alameda County Medical Center), and his residency training in Emerg...