- Professor, Department of Electrical and Computer Engineering, University of California, San Diego,(1995-present)
- Consultant, Qualcomm Inc., Fall 2000
- Visiting Researcher, Speech Technology Department, Microsoft Research, (Summer 1997)
- Consultant, Speech Research Department, AT&T Bell Laboratories, Murray Hill, New Jersey, (Jan.-June, 1995)
- Associate Professor, Department of Electrical and Computer Engineering, University of California, San Diego. (1989-1995)