been released to indoor and outdoor environments at federal and state hazardous-waste sites. Her research interests include development of probabilistic human exposure models, field surveys to collect data needed to support risk assessment, identification of research priorities for improving dredged-material management, and preparation of environmental-health educational materials. Dr. Vorhees conducted probabilistic analyses of multipathway exposure to polychlorinated biphenyls (PCBs) in residences near the New Bedford Harbor, MA, Superfund site, to PCBs and pesticides that accumulate in fish from an offshore dredged-material disposal site, and to PCBs, dioxins, and furans that accumulate in agricultural products from the floodplain of a contaminated river. She is an active member of the Society for Risk Analysis and the International Society of Exposure Analysis and served on the National Research Council Committee on Sediment Dredging at Superfund Megasites. Dr. Vorhees earned her ScD in environmental health from the Harvard School of Public Health.

MARY SNOW WOLFF is professor of community and preventive medicine and professor of oncologic sciences at the Mount Sinai School of Medicine. She is also director of the Center for Children’s Environmental Health and Disease Prevention Research, a multidisciplinary research program funded by the National Institutes of Health and the Environmental Protection Agency. Her research interests center around application of biologic markers to determine exposures of humans to chemicals that occur in the environment. Environmental exposures are considered in the context of diet, lifestyle, and individual susceptibility factors and in the context of their relationship to cancer risk, to reproductive dysfunction, and to developmental disorders. She has been involved in numerous studies of occupational and ambient environmental exposures to polycyclic aromatic hydrocarbons, organochlorine pesticides, and polychlorinated biphenyls. She has also investigated lead poisoning, dermal exposures, and chemicals in breast milk. She has collaborated in several studies of breast-cancer risk associated with environmental exposures and the genetic determinants of the risk. More recently, she has shifted emphasis to newly identified exposures that may be most relevant to the 21st century. Dr. Wolff earned a PhD in organic chemistry from Yale University.

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