2012 Visiting Professor of Physics, University of Illinois at Urbana-Champaign (UIUC)
2010 Visiting Professor of Physics, UIUC
2006 Visiting Professor of Physics, UIUC
2005 Adjunct Professor of Physics, Eastern Illinois University (EIU)
2003 - Professor Emeritus, EIU
2001 Acting Interim Associate Chair, Physics, EIU
2000 - Advisory Board, Physics and Optical Engineering, Rose-Hulman Institute of Technology,
Terre Haute IN
1996 - 1997 Visiting Professor of Physics, UIUC
1987 - 1994 Chair, Department of Physics, EIU
1984 - 2003 Professor of Physics, EIU
1980 - 1984 Associate Professor of Physics, EIU
1981 - 1982 Visiting Associate Professor of Physics, UIUC
1976 - 1980 Assistant Professor of Physics, EIU
1972 - 1976 Commissioned Submarine Project Officer, Division of Naval Reactors
(ADM H G Rickover's headquarters staff), USERDA/USAEC (now NRC)
1970 - 1971 Assistant Professor of Physics, EIU