2005 Adjunct Professor James Madison University

2005 Adjunct Faculty, College of Nursing and Health Sciences, GMU

2001- 2003 Member, University of Maryland Council for Security and Counter-Terrorism Studies

2001-2002 Visiting Professor, International Programs, University of Maryland, College Park, MD

1995 - Present Lecturer in Space Physiology and Medicine and Public Health, Moscow State University, Russia

1996 - 2001 Visiting Faculty East – West Space Science Center, University of Maryland, College Park, Maryland

1992 - 1996 Chief Medical Officer, Office of Space Flight, NASA Headquarters, Washington, DC

1993-1996 Deputy Associate Administrator for Operations and Space Flight, Office of Life and Microgravity Sciences and Applications, NASA
Headquarters, Washington, DC

2000-2001 Chief Health and Medical Officer, NASA Headquarters, Washington, DC

1996-2001 Designated Agency Health and Safety Officer (NASA)