Wernher Magnus Maximilian Freiherr von Braun was a German-American aerospace engineer and space architect. He became a member of the Nazi Party and then the Allgemeine SS to support his rocket work. He led the development of rocket technology in Nazi Germany, and later of rocket and space technology in the US.
As a young man, von Braun worked in Nazi Germany's rocket development program. He helped design and co-developed the V-2 rocket at Peenemünde Army Research Center during World War II. The V-2 became the first artificial object to travel into space by crossing the Kármán line on 20 June 1944. Following the war, he was secretly moved to the United States, along with about 1,600 other German scientists, engineers, and technicians, as part of Operation Paperclip. He worked for the United States Army on an intermediate-range ballistic missile program, and he developed the rockets that launched the United States' first space satellite Explorer 1 in 1958.