- 1986--...
- Treasurer, Celestial Mechanics Institute, for
Kluwer Academic Publishers; Dordrecht, The Netherlands
- 1985--...
- Associate Director, Center for Mathematical Services,
University of South Florida, Tampa, FL 33620
- 1979--...
- Director, Astronomy Program, University of South
Florida, Tampa, FL 33620
- 1973--1976
- Acting Chairman (Part-time), Department of Astronomy,
University of South Florida, Tampa, FL 33620
Carol Williams