ing all domestic and offshore clay, oil shale, zircon, barium and strontium, and drilling-mud activities. Mr. Ampian also served as a principal mineralogist in the USBM with research outreach to all federal, state, and international regulatory agencies, including publishing and lecturing on the Department of Interior’s position on asbestos, crystalline silica, and clay locatable matters. Currently, he serves as a consultant on crystalline silica.

JOHN R. BALMES, M.D., is professor of medicine at the University of California, San Francisco, and chief of the Division of Occupational and Environmental Medicine at San Francisco General Hospital. He is also professor of environmental health sciences at the University of California, Berkeley, and director of the Northern California Center for Occupational and Environmental Health. His research is in the area of occupational and environmental respiratory disease. He studies the acute effects of inhalation exposures to ambient air pollutants in his human exposure laboratory at San Francisco General Hospital and the chronic effects of such exposures in epidemiological studies with collaborators at the University of California, San Francisco, and the University of California, Berkeley. He is also interested in genetic determinants of responses to air pollutants. For the past five years, Dr. Balmes has been leading research, funded by the Centers for Disease Control and Prevention (CDC), to assist in the development of a national program to link environmental hazards with health outcomes data to improve the tracking of diseases potentially related to environmental exposures. Dr. Balmes received the Environmental and Occupational Medicine Academic Award from the National Institute of Environmental Health Sciences (NIEHS), 1991–1996. He was appointed the physician member of the California Air Resources Board in December 2007. Dr. Balmes received his M.D. from Mt. Sinai School of Medicine in 1976.

PATRICK N. BREYSSE, Ph.D., is professor in the Department of Environmental Health Sciences and director of the Division of Environmental Health Engineering at the Johns Hopkins University Bloomberg School of Public Health. He is also program director of the Industrial Hygiene Training Program and director of the Center for Childhood Asthma in the Urban Environment. His main research interest is in exposure assessment, including pollutant source characterization, exposure measurement and interpretation, development and use of biomarkers of exposure-dose-effect, and evaluating relationships between sources,

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