2018 to 2022: Interim Head, Department of Animal Sciences, NDSU, Fargo, ND
2002 to present: Associate Professor, Department of Animal Sciences, NDSU, Fargo, ND
1996 to 2002: Assistant Professor, Department of Animal Sciences, NDSU, Fargo, ND
1992 to 1996: Graduate Research Assistant/Fellow, Department of Animal Sciences, University of Kentucky, Lexington, KY
1986 - 1992: Ruminant Nutrition Laboratory Supervisor, Department of Animal Science, University of Nebraska - Lincoln, Lincoln, NE
1984 - 1986: Graduate Research Assistant, Department of Animal Science, University of Nebraska - Lincoln, Lincoln, NE
