versity, where he received the Kaiser Teaching Excellence Award as Best Clinical Teacher in 1991. He serves on the editorial boards of three prestigious journals, and is the author of more than 100 professional publications, including a book on differential diagnosis and 15 book chapters. His current research is supported by grants from the Department of Defense, Department of Veterans Affairs, several institutes at the National Institutes of Health, and Agency for Health Research and Quality.


ROY L. DEHART, M.D., M.P.H., is director of the Vanderbilt Center for Occupational and Environmental Medicine. Dr. DeHart completed medical school and his internship at the University of Tennessee College of Medicine, Memphis, and his residency in aerospace medicine at Johns Hopkins University and the United States Air Force (USAF) School of Aerospace Medicine. He is board certified in aerospace medicine and occupational medicine. In his assignment as chief of aerospace medicine for Air Force Systems Command, Dr. DeHart maintained an active role with the National Aviation and Space Administration. He served as a medical monitor of manned space flights as well as on a number of research panels addressing future manned space operations. As a senior aerospace medical officer he commanded the Air Force’s Aerospace Medical Research Laboratory at Wright Patterson Air Force Base, Ohio; his final assignment was as commander of the USAF School of Aerospace Medicine. After 23 years in the Air Force, he shifted his activities to the field of occupational medicine and became interested in the phenomena known as multiple chemical sensitivity. He is a senior aviation medical examiner for the Federal Aviation Administration and sees both private and commercial pilots for their medical certification. He currently serves on the Presidential Advisory Board on Radiation and Worker Health. He is the recipient of numerous honors and awards, the most recent being the Knudson Award presented by the American College of Occupational and Environmental Medicine. Dr. DeHart is the editor of three editions of the textbook Fundamentals of Aerospace Medicine, which has been described by reviewers as the premier text in the discipline.


R. J. MICHAEL FRY, M.D., is retired from Oak Ridge National Laboratory, where he was head of the cancer section of the biology division. He continues to serve as consultant to the life sciences division of the laboratory and as professor at the University of Illinois. He holds M.B., B.Ch., and M.D. degrees from the University of Dublin, Ireland. Previous appointments include as senior scientist in the division of biology and medicine at Argonne National Laboratory and professor in the Department of Radiology, University of Chicago. He was editor of Radiation Research and continues as a consulting editor. His research focused on the effects, in particular, carcinogenesis, of ionizing and ultraviolet radiation. He is a member of the International Committee on Radiation Protections Committee 1; member of the National Council on Radiation Protection’s Committees 1, 4, 7, 75, and 88; and chairman of the National Research Council’s Board on



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