Postdoctoral research fellow University British Columbia, Vancouver, Canada, 1972-1974. Research associate Pennsylvania State University, State College, 1974-1976. Research professor, plant physiologist United States Department of Agriculture Agricultural Research Service University Minnesota, St. Paul, since 1976.
Visiting professor Danish National Laboratories Roskilde, Denmark, 1988. Organization of European Cooperation and Development fellow Max Planck Institute, Cologne, Germany, 1982.
- Author: (with others) Advances in Nitrogen Fixation Research, 1984, Plant Proteolytic Enzymes, 1986, Molecular Determinants of Plant Diseases, 1987, Alfalfa and Alfalfa Improvement, 1987. Member editorial board Plant Physiology, Crop Science, Phytopathology. Contributor over 150 articles to professional publications including Canada Journal Biochemistry, Biochemistry Journal, Crop Science, Plant Physiology, Journal Experimental Botany, and others.
1972 - 1974
1974 - 1976