Distinguished University Professor, Department of Civil and Environmental Engineering (Joint appointment, Department of Chemical and Biomedical Engineeering, 2010), University of South Florida, Aug. 1999-present.  Professor of Materials Engineering,  Aug. 1991-Aug.1999.   Associate Professor, Aug. 1985-Aug. 1991. Tenured since May, 1989.


Board Member, appointed by President Clinton, United States Nuclear Waste Technical Review Board, Jan.1997- June 2002 


Associate Laboratory Director, Materials Engineering (1982-1985);  Manager,  Metallurgy and Materials (1980-1982) and Senior Metallurgist (1978-1980), Kentucky Center for Energy Research Lab., Lexington, KY. 


Associate Professor (1984-1985) and Adjunct Assistant Professor (1979-1985), Joint Appointment at the Department of Metallurgical Engineering and Materials Science, University of Kentucky, Lexington, KY. 


Research Associate, Materials Science Division, Argonne National Laboratory, Argonne, IL, 1976-1978. 


Guest Scientist, Solid State Research Institute, Juelich Nuclear Research Center (KFA), Juelich, West Germany, 1974-1976. 


Postdoctoral Research Associate, Dept. of Metallurgy and Materials Science, Case Western Reserve University, Cleveland, OH, 1973-1974.


 Visiting Assistant Professor, Henry Krumb School of Mines, Columbia University, New York, NY, 1972-1973.