From Wikipedia, the free encyclopedia. Eugene Andrew Cernan was an American astronaut, naval aviator, electrical engineer, aeronautical engineer, and fighter pilot. During the Apollo 17 mission, Cernan became the eleventh person to walk on the Moon. Since he re-entered the lunar module after Harrison Schmitt on their third and final lunar excursion, he was the last person to have walked on the Moon. Cernan traveled into space three times; as... see more