2013-present Oregon State University, Corvallis, OR. Professor Emeritus of Weed Science,
Columbia Basin Agricultural Research Center, Pendleton, OR
2003-2013 Oregon State University, Corvallis, OR. Professor of Weed Science,
Columbia Basin Agricultural Research Center, Pendleton, OR
1996-2003 Oregon State University, Corvallis, OR. Associate Professor of Weed Science,
Columbia Basin Agricultural Research Center, Pendleton, OR.
1991 -1996 Oregon State University, Corvallis, OR. Assistant Professor of Weed Science,
Columbia Basin Agricultural Research Center, Pendleton, OR.
1988-1991 United States Department of Agriculture, Research Agronomist,
Great Plains Systems Research. Ft. Collins, CO
1987-1988 University of Wyoming, Post-Doctoral Fellow
Department of Plant, Soil and Insect Sciences, Laramie, WY
1984-1987 University of Wyoming, Graduate Research Assistant,
Department of Plant, Soil and Insect Sciences, Laramie, WY
1981-1984 University of Nevada, County Extension Agent,
Cooperative Extension Service, Minden, NV
1980-1981 University of California, Staff Research Associate II,
Department of Nematology, Riverside, CA