Dr. Siegfried Fred Singer (1924- ) is a professor, physicist, and administrator. Singer emigrated to the United States from Vienna in 1940 (naturalized 1944) and attended Ohio State University (BEE 1943; D.Sc. (honorary) 1970) and Princeton (AM 1944, Ph.D. (physics) 1948). He taught briefly as a doctoral candidate at Princeton (1943-44) before joining the Johns Hopkins University Applied Physics Laboratory as a physicist (1946-50). He acted as the Office of Naval Research Scientific Liaison Officer at the US Embassy in London (1950-53), then joined the faculty of the University of Maryland (assoc. professor, physics 1953-59; professor 1959-62). He continued to alternate between public and academic positions, working at the National Weather Satellite Center, Department of Commerce (Director, 1962-64); School of Environmental and Planetary Science, University of Miami (Dean, 1964-67); Department of the Interior (Deputy Assistant Secretary for Water Quality and Research, 1967-70); University of Virginia (Professor, Environmental Science, 1971-87); and the Department of Transportation (Chief Scientist, 1987-89). Singer authored a number of papers and articles on astrophysics, space exploration, and environmental issues and was involved in formulating public policies on these topics.