- Professor, Electrical and Computer Engineering, University of California, Davis, CA, 2000-
- Associate Professor, Electrical and Computer Engineering, University of California, Davis, CA, 1994-2000
- Assistant Professor, Electrical and Computer Engineering, University of California, Davis, CA, 1988-1994
- Visiting Research Scientist, IBM Almaden Research Center, San Jose, CA, 1987-1988
- Post Graduate Researcher, California Institute of Technology, CA, 1986-1987