Margit Bleecker is director of the Center for Occupational and Environmental Neurology in Baltimore, Maryland. Her research interests are in clinical industrial neurotoxicology and occupational neurology. She has served on several Institute of Medicine committees, including two terms on the Committee to Review the Health Effects of Vietnam Veterans of Exposure to Herbicides. She received her PhD from the State University of New York Downstate Medical Center and her MD from the University of California, San Francisco School of Medicine. Dr. Bleecker is certified by the American Board of Psychiatry and Neurology.

Gary P. Carlson is professor of toxicology in the School of Health Sciences of Purdue University. His research interests are in examining the relationship between the metabolism of chemicals and their toxic actions, including an interest in activation and detoxification pathways in the liver and other target organs. Current research involves using a variety of techniques, ranging from in vitro assays to animal bioassays, to examine the biochemical mechanisms by which chemical agents exert their toxic and carcinogenic actions. He has served on several National Research Council committees, most recently as chair of the Subcommittee on Toxicologic Assessment of Low-Level Exposures to Chemical Warfare Agents and currently as a member of the Committee on Toxicology and the Committee on Combined Exposures to Hydrogen Cyanide and Hydrogen Monoxide in Army Operations. Dr. Carlson received his PhD in pharmacology from the University of Chicago.

Linda D. Cowan is George Lynn Cross Professor and chair of the Department of Biostatistics and Epidemiology of the University of Oklahoma Health Sciences Center. Her research interests include cardiovascular-disease epidemiology and the relative importance of risk factors in American Indian men and women, neurologic disorders, and perinatal epidemiology. Her recent research includes analysis of risk-factor profiles for early-onset and late-onset coronary heart disease in American Indians, investigation of the role of environmental toxicants and congenital hearing loss, and studies in west Africa of the prevalence of and risk factors for epilepsy associated with neurocysticercosis. Dr. Cowan has served on the National Research Council Committee to Assess the Health Implications of Perchlorate Ingestion and the Institute of Medicine (IOM) Committee to Assess the Safety and Efficacy of the Anthrax Vaccine. She is a member of the IOM Board on the Health of Select Populations. She received her PhD in epidemiology from Johns Hopkins University.

Mary E. Davis is a professor in the Department of Physiology and Pharmacology of the West Virginia University Health Sciences Center. Her research interests are in the toxicology of environmental and occupational pollutants, including water-disinfection byproducts, halogenated solvents, and arsenic. She is particularly interested in mechanisms of toxicity in the liver, kidneys, and vascular system. Dr. Davis was treasurer of the Society of Toxicology and is a former

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