Propulsion Officer, Mission Operations Directorate (1978–1985)
Head, Integrated Communications Section, Mission Operations Directorate (1985)
Head, Propulsion Systems Section, Mission Operations Directorate (1986–1988)
Flight Director, Mission Operations Directorate (1988–2003)
Deputy Chief Shuttle Operations, Flight Director Office, (2001–2003)
Launch Integration Manager, Space Shuttle Program – KSC, Florida (2003)
Deputy Manager, Space Shuttle Program (2003–2005)
Director, Space Shuttle Program (2005-2008)
Deputy Program Administrator, Strategic Partnerships, NASA HQ, Washington, DC
