August 2003-present: Endowed Professor of Philosophy, Agricultural Economics and Community, Agriculture, Recreation and Resource Studies - Michigan State University
July 1997 to August 2003: Distinguished Professor of Philosophy - Purdue University.
July 1999 to August 2003: Director, Center for Food Animal Productivity and Well-Being - Purdue University
Sept. 1992 to July 1997: Professor of Philosophy and Agricultural Economics - Texas A&M University
Sept. 1990 to July 1997: Director, Center for Science and Technology Policy and Ethics (formerly Center for Biotechnology Policy and Ethics), Institute for Bio-sciences and Technology - Texas A&M University
Sept. 1987 to Aug. 1992: Associate Professor of Philosophy and Agricultural Economics - Texas A&M University
Sept. 1986 to Aug. 1987: Visiting Scholar, U.S. Agency for International Development - Washington D. C.
Sept. 1982 to Aug. 1986: Assistant Professor of Philosophy and Agricultural Economics - Texas A&M University
Sept. 1981 to June 1982: Visiting Assistant Professor of Philosophy - Texas A&M University
Sept. 1975 to June 1980: Graduate Council Fellow, Department of Philosophy - SUNY Stony Brook