in medicine, with a special emphasis on cancer. He was editor-in-chief of the Journal of the National Cancer Institute for 6 years and a member of the editorial board of the New England Journal of Medicine for 7 years. Dr. Bailar was elected to the Institute of Medicine in 1993 and is a member of the International Statistical Institute. He received his M.D. from Yale University and his Ph.D. in statistics from American University.

Hugh Ellis is the chair of the Department of Civil Engineering at the Johns Hopkins University in Baltimore, and he holds a joint appointment in the Department of Geography and Environmental Engineering. His research interests focus on the development of uncertainty and risk-based approaches for environmental management, including the use of such techniques for assessing air quality and emissions control policies in Maryland. He served on the NRC Committee on the Effectiveness of Vehicle Emission Inspection and Maintenance Programs. He received his B.S., M.S., and Ph.D. in civil engineering from the University of Waterloo in Ontario, Canada.

Alison Geyh is an assistant professor at the Johns Hopkins Bloomberg School of Public Health. Her research interests focus on quantifying airborne contaminants, identifying their sources, investigating their chemical composition, and assessing the routes of human exposure. Her current projects include an assessment of personal exposure to mobile-source related pollutants, an examination of the metal content of ambient fine particulate matter, and an exploration of the potential relationship between exposure to fine particles and exacerbations of symptoms related to congestive heart failure. She is the principal investigator of a large ongoing project focused on assessing exposure and health outcome of workers who were involved in the cleanup and recovery effort at the World Trade Center disaster site. Dr. Geyh previously held an appointment as a staff scientist for the Health Effects Institute, which is funded jointly by EPA and the automotive industry. Dr. Geyh received her Ph.D. from Brandeis University in physical organic chemistry.

David Greene is a corporate fellow of Oak Ridge National Laboratory (ORNL). His research interests are in energy and environmental policy analysis in the transportation sector, including analyses of policies to mitigate greenhouse gas emissions from the transportation sector, modeling of energy and transportation demand, and assessment of the economics of petroleum dependence and market responses to advanced transpor-

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