2002-present: Professor, Departments of Government and Philosophy, University of Texas at Austin.
1995-2002: Associate Professor, Departments of Government and Philosophy, University of Texas at Austin.
1988-1995: Associate Professor, Department of Government, University of Texas at Austin.
1981-1988: Assistant Professor, Department of Government, University of Texas at Austin.
1980-1981: Acting Instructor, Departments of Political Science, Yale University.