Subsystem Manager, Apollo Propulsion and Power Systems
Chief, Power Generation Branch, Propulsion and Power Division
Chief, Laboratory Operations Office, Engineering and Development Directorate
Chief, Engineering Division, Center Operations Directorate (1973-1975)
Manager, Earth Resources Program
Deputy Director, Earth Resources, Space and Life Sciences Directorate
Director, Space and Life Sciences Directorate
Assistant to the Director, Research and Engineering Directorate (1983-1884)
Manager, International and External Affairs Office, Space Station Program Office
Special Assistant to the Space Station Freedom Program Director
