John Watts Young is a former NASA astronaut who walked on the Moon on April 21, 1972 during the Apollo 16 mission.
Young enjoyed one of the longest and busiest careers of any astronaut in the American space program. He twice journeyed to the Moon, was the first person to fly into space six times, and is the only person to have piloted in space four different classes of spacecraft: Gemini spacecraft, Apollo Command/Service Module, Apollo Lunar Module, and Space Shuttle.