- Staff Member - Sandia National Laboratories, Radar Signal Anaylsis Division, January 1979 to August 1985.
- Adjunct Professor - University of New Mexico, September 1984 to May 1985.
- Instructor - Auburn University, September 1985 to February 1990.
- Assistant Professor - University of Mississippi, February 1990 to July 1994.
- Consultant - U.S. Army Research Office under a Scientific Services Contract, July 1990 to December 1995.
- Associate Professor - University of Mississippi, August 1994 to Present.
- Visiting Professor - Boise State University, August 2001 to May 2002.