Ph.D., Mechanical Engineering, California Institute of Technology, December 1990, Thesis Topic: Inorganic Components of Atmospheric Aerosols M.S., Mechanical Engineering. Massachusetts Institute of Technology, January 1978, Thesis Topic: Electrostatic Charging of Jet Fuel B.S., Engineering Physics, University of California, Berkeley, June 1976 2009-present: Director, Crocker Nuclear Laboratory, University of California, Davis 2005-present: Director, Air Quality Research Center, University of California, Davis 2000-present: Professor, Mechanical and Aerospace Engineering, Civil and Environmental Engineering, and Land, Air and Water Resources, University of California, Davis 1999-2000: Professor, Department of Mechanical Engineering, University of Delaware 1994-1999: Associate Professor, Department of Mechanical Engineering, University of Delaware 1991-1994: Assistant Professor, Department of Mechanical Engineering, University of Delaware 1984-1990: Research Associate, Department of Physiology and Biophysics, University of Southern California School of Medicine 1983-1984: Engineer, BMDP Statistical Software (Developers of statistical software), Los Angeles, CA 1978-1983: Engineer, Berkeley Solar Group (HVAC energy conservation consultants), Berkeley, CA