| Ph.D. - Washington State University; Soil chemistry/biochemistry; 1976-1979
|
| M.S. - San Diego State University; Physical organic chemistry; 1971-1974 |
| B.S. - San Diego State University; Chemistry; 1965-1968 |
| 1986-present Soil Scientist, USDA, ARS, St. Paul, MN and Adjunct Professor, Department of Soil, Water, and Climate, University of Minnesota |
| 1981-1986 Soil Scientist, USDA, ARS, Stoneville, MS |
| 1979-1981 Research Associate, Dept. of Soil Science, University of Wisconsin
|
| 1976-1979 Research Assistant, Dept. of Agronomy and Soils, Washington State University |
| 1974-1976 Professor of Chemistry, Escuela Agricola Panamericana, El Zamorano, Honduras |
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