Pediatrics intern Keesler United States Air Force Medical Center, Biloxi, Mississippi, 1974-1975. Course director United States Air Force Physician Assistant School, Sheppard Air Force Base, Texas, 1976-1978. Special projects consultant Medical Networks, Inc., Houston, 1979-1981.
Director medical products Microprocessor Laboratories, Inc., 1983. Chief medical officer, director Mediclinic, Inc., 1984-1985. President, consultant Working Hypothesis, Inc., 1981-1983, 85-87.
Project leader Telescan, Inc., 1987-1989. Medical director McCarty Clinic, 1989-1990, Fort Bend Family Health Center, 1990-1991, Doctors at the Galleria, 1991-1992. Chief medical officer Health Testing, Inc., 1991.
Medical director Houston Pro Medical, 1992-1993, Heights Occupational Medical Clinic, 1994, Suburban Physician's Center, 1995-1997, Diagnostic Center for Men, 1998, CIGNA Healthcare Center, 1999-2000, Quitman Community Medical Center, 2000—2003.
Member Rocky Mountain Bioengring. Symposium. Lieutenant colonel United States Air Force, 1969-1978. Member of Institute of Electrical and Electronics Engineers, Canada Medical and Biological Engineering Society, International Neural Network Society, Association for Computing Machinery (Association for Computing Machinery (ACM) News Houston chapter 1990-1991, editor SIG Forth Newsletter 1990-1994, associate editor Association for Computing Machinery (ACM) Sigplan Notices 1995—2003), American Association Medical Systems and Informatics, American Association Medical Director, Mensa.