- 1980--...
- U.S. Naval Observatory, Washington, D.C. 20392
- 1988--...
- Consultant, Department of Orbital Mechanics
- 1980--1981
- Consultant, Nautical Almanac Office
- 1964--1984
- Jet Propulsion Laboratory, Pasadena, CA 91103
- 1984
- Consultant
- 1975
- Consultant
- 1965
- Associate Research Engineer
- 1964
- Associate Research Engineer
- 1983
- Space Telescope Science Institute, Baltimore, MD 21218,
Consultant, Guide Star Selection System
Carol Williams