Happy Birthday to Harrison Schmitt, Lunar Module pilot for Apollo 17 and the only scientist to set foot on the Moon.
Schmitt was originally scheduled to fly on Apollo 18. When that mission was cancelled NASA was pressured to send a geologist to the Moon and Schmitt was bumped up to the Apollo 17 mission.
He was the last person to exit a craft and set foot on the Moon, though Eugene Cernan, the mission commander, was the last to re-enter the Lunar Module after the final moonwalk which makes Cernan the last person to step on the Moon.
Post NASA, Schmitt has been a university professor and served one term as Senator from New Mexico.