Kevin D. Crowley joined the National Academies? staff in 1993, where since 1996 he has been director of the Board on Radioactive Waste Management (BRWM) of the National Research Council. During the past decade his professional interests and activities have focused primarily on the application of science and technology to difficult public policy problems. He holds a Ph.D. in geology from Princeton University and has held teaching and research positions@the U.S. Geological Survey, the University of Oklahoma and Miami University of Ohio. Address: BRWM, The National Academies, 500 Fifth Street, N.W., Washington, DC 20001. Internet: kcrowley@nas.edu