Ph.D. (1986), Botany/Weed Science, University of California, Davis
M.A. (1981), Biological Sciences, Humboldt State University, Arcata, CA
B.S. (1978), Wildlife and Fisheries Biology, University of California, Davis


1995-present: Non-Crop Weed Specialist, Department of Plant Sciences, University of California, Davis

1987-1994: Assistant and Associate Professor, Soil, Crop and Atmospheric Sciences Department, Cornell University, Ithaca, New York


Aquatic Plant Management Society (also Western Chapter of Aquatic Plant Management Society)
Joe with MikaniaCalifornia Weed Science Society
Western Society of Weed Science
Weed Science Society of America
California Invasive Plant Council
Society of Range Management (also Pacific Chapter of Society of Range Management)


Jake Sigg Award for Vision and Dedicated Service awarded by the California Invasive Plant Council (Cal-IPC), 2011
Selected as Fellow of the Weed Science Society of America, 2011
Gold Award by the Association for Communication Excellence for the two volume book “Weeds of California and Other Western States”, 2007
Outstanding Weed Scientist, Public Sector, Western Society of Weed Science, 2004
Finalist, Award of Excellence, Friends of Agriculture Extension, University of California System, 2000, 2001, and 2002
Award of Excellence, California Weed Science Society, 1999        
Distinguished Service Award, DANR, Outstanding Research-Specialist, 1998
American Society for Horticultural Science, Extension Division Educational Materials Award for Commercial Ornamentals, Floriculture and Turf, Weeds of the Northeast, 1998