Wernher von Braun (1912-1977) developed German military rockets (VI and V2) during World War II, and later worked for NASA in the USA.
Short Biography:
During the 1940s his research team at Peenemunde on the Baltic coast produced the VI (flying bomb) and supersonic V2 rockets.
In the 1950s von Braun was part of the team that produced rockets for US satellites (the first,. Explorer I, was launched early 1958) and early space flights by astronauts.