Harrison Schmitt

Harrison Schmitt is an American geologist, a retired NASA astronaut, university professor, and a former U.S. senator from New Mexico. He was the twelfth and last man to walk on the Moon, as Apollo 17 crewmate Eugene Cernan exited the Apollo Lunar Module first. However, as Schmitt re-entered the module first, Cernan became the last astronaut to walk on and depart the moon. Schmitt is also the only geologist as well as the only person to have walked on the Moon who was never a member of the United States Armed Forces, although he is not the first civilian, since Neil Armstrong left military service prior to his landing in 1969.