Harrison Schmitt

Harrison Hagan "Jack" Schmitt (born July 3, 1935) is an American geologist, a retired NASA astronaut, university professor, and a former U.S. senator from New Mexico.Schmitt was the first of NASA's first scientist astronaut group to fly in space, on the Apollo 17 mission in December 1972. He was the twelfth and last man to set foot on the Moon. As of 2013 he is the only professional geologist to visit the Moon.