Asst Prof of Animal Science, Oklahoma State University, 1980-1984
Assoc Prof of Animal Science, Oklahoma State University, 1984-1988
Professor of Animal Science, Oklahoma State University, 1988-2007
Graduates of Distinction Professor of Animal Science, Oklahoma State University, 2005-2007
Professor and Head, Department of Animal Sciences, North Dakota State University, 2007-2009
Professor, Department of Animal Sciences, North Dakota State University, 2007-current