and toxicants in air, water, soil, and other media. Activities include reviewing epidemiologic and toxicologic data to identify hazards and derive risk-based assessments, developing guidelines to identify chemicals hazardous to the public, recommending air-quality standards, identifying toxic air contaminants, developing public-health goals for water contaminants, preparing evaluations for carcinogens and reproductive toxins (Proposition 65), issuing sport-fish advisories, training health personnel on pesticide-poisoning recognition, reviewing hazardous-waste site risk assessments, and conducting multimedia risk assessments. Previously, he was chief of the Air Toxicology and Epidemiology Section of OEHHA from October 1990 through February 1998. Dr. Alexeeff has over 50 publications in the fields of toxicology and risk assessment. He earned his PhD in pharmacology and toxicology from the University of California, Davis.

Gregory B. Baecher is a professor in the civil engineering program at the University of Maryland. He was elected to the National Academy of Engineering in 2006. Previously, Dr. Baecher served on the faculty of civil engineering at the Massachusetts Institute of Technology and as the CEO of ConSolve Incorporated in Lexington, Massachusetts. His expertise includes risk analysis, water-resources engineering, and statistical methods. Dr. Baecher has served on numerous National Research Council committees and panels. He earned his PhD in civil engineering from the Massachusetts Institute of Technology.

A. John Bailer is distinguished professor in the Department of Mathematics and Statistics and a senior researcher in the Scripps Gerontology Center at Miami University in Oxford, Ohio. His research interests include the design and analysis of environmental- and occupational-health studies and quantitative risk estimation. Dr. Bailer is a fellow of the American Statistical Association (ASA), a fellow of the Society for Risk Analysis, and a recipient of the ASA Statistics and the Environment Distinguished Achievement Medal. He has served on a number of National Research Council committees. He also has served as a member of subcommittees of the Board of Scientific Counselors of the National Toxicology Program. He received his PhD in biostatistics from the University of North Carolina at Chapel Hill.

Roger M. Cooke is the Chauncey Starr Senior Fellow at Resources for the Future (RFF). His research interests include the mathematical modeling of risk and uncertainty, structured expert-judgment methods, and the

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