Michael Collins was one of the third group of astronauts named by NASA in October 1963. He served as pilot on the 3-day Gemini 10 mission. His second flight was as command module pilot of the historic Apollo 11 mission in July 1969. He remained in lunar orbit while Neil Armstrong and Buzz Aldrin became the first men to walk on the Moon.
For more information on the Apollo Program, visit https://www.nasa.gov/specials/apollo50th/