Organization Scott Air Force Base

National Air and Space Museum (curator)

National Aeronautics and Space Administration (chief historian)

American Astronautical Society

International Academy of Astronautics

American Association for the Advancement of Science

American Institute for Aeronautics and Astronautics

Society for History in the Federal Government

Mormon History Association (president)

John Whitmer Historical Association

Military Airlift Command, Scott Air Force Base, Illinois (command historian)

Hill Air Force Base (chief of office of history)