2003-       Professor, University of California, Berkeley, CA

2000-03   Associate Professor, University of California, Berkeley, CA

1999-00   Senior Scientist, Sokoke Inc. El Cerrito, CA 94530

1998-00   Consultant, Ecorisk, Inc., Ferndale, WA 98248

1994-00   Assistant Professor, University of California, Berkeley, CA

1994         NIH Adjunct Postdoctoral Fellow, NIH, Bethesda, MD

1993-94   NSF Postdoctoral Fellow, University of California, Berkeley, CA

1992-93   Graduate Student Instructor, University of California, Berkeley, CA

1990-93   Research Associate, University of California, Berkeley, CA

1990-92       Free Lance Technician and Consultant, Biosystems, Tiburon, CA

1989         Field Assistant, Conservation Agency, Wash., D.C.