- Professor - Utah State University, July 1, 1995 to present
- Associate Director for Research Center for Integrated BioSystems, Utah State University, July 1, 2006 to present.
- Director - Center For Developmental & Molecular Biology (Utah Centers of Excellence Program), Utah State University, July 1, 1993 to 1998.
- Associate Professor - Utah State University, July 1, 1991 to June 30, 1995 (Tenured 7-1-94)
- Associate Professor - Louisiana State University, July 1, 1990 to June 30, 1991.
- Assistant Professor - Louisiana State University, March 1, 1986 to June 30, 1990.
- Research Assistant - University of California, September 1, 1982 to February 28, 1986.
- Embryologist and Research Physiologist - B.E.T. Genetics, Inc., Wheatland, California, January 1, 1982 to September 1, 1982.
- Research Assistant - University of California, Davis, September 1, 1980 to January 1, 1982.
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