epidemiological studies to investigate the health effects of an air pollution episode in London in 1991 and to assess the risk factors for asthma deaths. Dr. Anderson is a member of the steering group of the International Study of Asthma and Allergies in Childhood, the U.K. Department of Health’s Committee on the Medical Effects of Air Pollution, and the U.K. Department of Environment’s Expert Panel on Air Quality Standards. He also served as a member of several World Health Organization working groups on air pollution. Dr. Anderson received his M.D. from Melbourne University in Australia.

MAUREEN L. CROPPER is a professor of economics at the University of Maryland, a lead economist at the World Bank, and a university fellow at Resources for the Future. She is past president of the Association of Environmental and Resource Economists and a former chair of the Advisory Council for Clean Air Act Compliance Analysis, a subcommittee of EPA's Science Advisory Board. Her research has focused on valuing environmental amenities (especially environmental health effects), on the discounting of future health benefits, and on the tradeoffs implicit in environmental regulations. Her recent research focuses on factors affecting deforestation in developing countries and on the externalities associated with motorization. Dr. Cropper received her Ph.D. in economics from Cornell University.

JOHN S. EVANS is a senior lecturer on environmental sciences and the codirector of the Program in Environmental Science and Risk Management at the Harvard School of Public Health. His research focuses on risk assessment, uncertainty analysis, and decision-making in environmental health. Dr. Evans has developed and applied approaches for quantitatively characterizing the uncertainty in health risk assessments and for analyzing the value of information provided by alternative research strategies. He received a Sc.D. in environmental health sciences from Harvard University.

DALE B. HATTIS is a research professor at the George Perkins Marsh Institute at Clark University. His research focuses on the development and application of methods to assess the health impacts of regulatory options. His emphasis is on incorporating interindividual variability data into risk assessments for both cancer and noncancer end points. He has served as a member of several NRC committees (such as the Committee on Neuro-

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