Hans Michael Mark was a German-born American government official who served as Secretary of the Air Force and as a Deputy Administrator of NASA. He was an expert and consultant in aerospace design and national defense policy.

The Deputy Administrator of the National Aeronautics and Space Administration is the second-highest-ranking official of NASA, the national space agency of the United States. Administrator of NASA is NASA's chief decision maker, responsible for providing clarity to the agency's vision and serving as a source of internal leadership within NASA. The office holder also has an important place within United States space policy.