Head, Biological & Ecological Engineering Department, Oregon State University. July 2002-present
Associate Professor, Oregon State University, Bioresource Engineering Department. July 1994 - present. Activities include development of simulation models, nonlinear analysis tools and geographic information systems for agricultural and natural resource management.
Assistant Professor, Oregon State University, Bioresource Engineering and Crop & Soil Science Departments. July 1989 - June 1994. Activities include development of expert systems and simulation models for agricultural and natural resource applications.
Assistant Professor, Oregon State University, Crop & Soil Science Department. March 1988 -June 1989. Activities include development and integration of expert systems and crop models for agricultural applications.
Post-Doctoral Systems Research Scientist, Oregon State University, Crop & Soil Science Department, April 1987 - March 1988. Activities similar to above position.
Research Associate, Auburn University, Agricultural Engineering Department, February 1983 -April, 1987. Research related to analysis and simulation of agricultural and biological processes.