his B.S. in civil engineering and his M.S. and Ph.D. in sanitary engineering from the University of California, Berkeley.

FRANK J.BOVE is a senior epidemiologist for the Epidemiology and Surveillance Branch of the Division of Health Studies, Agency for Toxic Substances and Disease Registry. Dr. Bove has published several papers and reports on the epidemiology of exposure to drinking water contaminants and related adverse health effects. He received a B.A. in political science and philosophy from the University of Pennsylvania and an M.S. in environmental health science and Sc.D. in epidemiology from the Harvard School of Public Health.

LAWRENCE J.FISCHER is a professor in the Department of Pharmacology and Toxicology and is the director of the Institute for Environmental Toxicology at Michigan State University. He serves as chairperson of the Michigan Environmental Science Board. His primary research interest is biochemical toxicology. Specific research includes absorption, distribution, metabolism, and excretion of drugs and chemicals and toxicity of chemicals to the endocrine pancreas. Dr. Fischer received his B.S. and M.S. in pharmacy from the University of Illinois and his Ph.D. in pharmaceutical chemistry from the University of California, San Francisco.

WALTER GIGER is a professor at the ETH Zurich and at the University of Karlsruhe. He is the director of the Division for Chemical Pollutants at the Swiss Federal Institute for Environmental Science and Technology, Zurich. His research, teaching, and consulting activities focus on organic compounds in the environment and in the geosphere. Research topics include development of analytical techniques for identification of organic pollutants in drinking water, wastewater, and natural waters; investigation of sources, occurrences, and fate of organic pollutants in wastewater and drinking water; and evaluation of chemical, physical, and biological processes that determine the environmental fate of chemicals. Dr. Giger received his B.S. and Ph.D. in chemistry from ETH Zurich.

JEFFREY K.GRIFFITHS is director of the Graduate Programs in Public Health and an associate professor of family medicine and community health at Tufts University School of Medicine. His research is focused on the biology and epidemiology of the emerging waterborne disease cryptosporidiosis and the use of micronutrients to boost the immune systems of malnourished children. He currently serves on the

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