10/83 - 12/84, Polaroid Instruments, Cambridge, MA
01/84 - 12/85, General Semiconductor, Tempe, AZ
01/85 - 12/86, Litton Industries, Tempe, AZ
09/90 - 12/93, Epitronics, Phoenix, AZ
05/98 - present, Lawrence Semiconductor Research Laboratory, Tempe, AZ