2024-present: Emeritus Professor Department of Mechanical and Aerospace Engineering, University of Kentucky (after 1 August 2024)
2008-2024: Professor, Departments of Mechanical Engineering and Mechanical and Aerospace Engineering, University of Kentucky
2010-2019: Director, NASA Kentucky Space Grant Consortium and NASA EPSCoR Program
2004-2019: Donald and Gertrude Lester Professor of Mechanical Engineering, Department of Mechanical Engineering, University of Kentucky
1996-2008: Associate Professor, Departments of Engineering Mechanics and Mechanical Engineering, University of Kentucky
1990-1996: Assistant Professor, Department of Engineering Mechanics, University of Kentucky
1985-1990: Graduate Teaching Assistant, Graduate Research Assistant, Visiting Assistant Professor, Department of Engineering Science and Mechanics, VPI&SU
1980-1984: Senior, Lead Engineer, Harris Corporation, Government Aerospace Systems Division, Melbourne, FL
1977-1980: Undergraduate Research Assistant, Paper Grader, Graduate Research Assistant, Instructor, Department of Mechanical Engineering, Clemson University, Clemson, SC