A board-certified toxicologist with more than 35 years of experience, this expert focuses on evaluating human health and ecological risks associated with chemical exposures in the environment, workplace, and consumer products. His expertise includes health and ecological risk assessments for hazardous waste sites, Brownfields, mine and smelter sites, waste incinerators, landfills, military installations, radionuclide sites, vapor intrusion, indoor air quality, Proposition 65 compliance, crystalline silica exposure, contaminated buildings, and food, nutritional supplement, and consumer product safety assessments. He also has more than 30 years of expert witness experience providing consultations, depositions, and courtroom testimony involving toxicology, environmental exposures, and risk assessment.

His professional experience includes serving as Founding Principal, Principal, National Risk Assessment Practice Leader, National Partner and Practice Leader for Risk Assessment, Program Manager for Risk Assessment and Toxicology, Principal Toxicologist, Senior Toxicologist, Toxicologist/Risk Assessor, and Postgraduate Researcher for private toxicology consulting practices, environmental consulting organizations, and government agencies. His work has focused on directing, preparing, and reviewing human health and ecological risk assessments involving hazardous waste sites, contaminated properties, industrial facilities, mine and smelter operations, air toxic emission sources, consumer products, and occupational exposures. His experience also includes medical toxicology case reviews, Proposition 65 compliance evaluations, food and nutritional supplement safety assessments, vapor intrusion and indoor air investigations, radionuclide and ecological risk assessments, TSCA and REACH chemical registration support, toxicity peer review, and the application of probabilistic risk assessment methodologies to complex environmental and toxicological issues.

He earned a Ph.D. in Toxicology and Pharmacology, a Master of Public Health in Environmental Health, and a Bachelor of Science in Natural Resources. He is a Diplomate of the American Board of Toxicology (DABT), a European Registered Toxicologist (ERT), and a UK Registered Toxicologist. He has served as an Adjunct Assistant Professor teaching graduate-level toxicology and pharmacokinetics, authored peer-reviewed scientific publications and technical reports, and his professional memberships include the Society of Toxicology, the American College of Toxicology, the American College of Medical Toxicology, the American Academy of Clinical Toxicology, the Society of Toxicologic Pathology, and the International Society of Regulatory Toxicology and Pharmacology.