First Man: The Life of Neil A. Armstrong is the official biography of Neil Armstrong, the astronaut who became the first human to walk on the Moon, on July 20, 1969. The book was written by James R. Hansen and was first published in 2005 by Simon & Schuster. The book describes Armstrong's involvement in the United States space program (culminating in the historic Apollo 11 mission), and details his personal life and upbringing. The book was adapted into the 2018 film First Man.