Harrison "Jack" Schmitt PhD flew on one mission, the Apollo 17 lunar landing.
Harrison Schmitt's only space flight was on Apollo 17, the last lunar landing. Before his flight, he was instrumental in training other astronauts in the field of geology.
Many flew more missions than that.
7 astronaut did
Only one: Harrison "Jack" Schmitt, aboard Apollo 17 (Dec, 1972)
1, Harrison Schmitt was the Lunar Module Pilot on Apollo 17.
The Apollo program consisted of a total of 17 missions, with 10 crewed missions (Apollo 7-17) and 7 unmanned missions.
Space Shuttle Columbia flew a total of 28 missions, starting with its first mission in 1981 and ending with its final mission in 2003 when it tragically disintegrated upon re-entry.
As of October 2023, only four astronauts who walked on the Moon are still alive. They are David Scott, Charles Duke, Charles "Charlie" Bolden, and Harrison Schmitt. These astronauts participated in NASA's Apollo missions, which took place between 1969 and 1972.
A pair of short range exploration vehicles or shuttles flew off of Destiny during many of the planetary missions the Destiny Crew was involved in.
Over its flight career, Endeavour flew 122,853,151 miles on 25 missions and spent 299 days in space.
There were three people on every Apollo lunar mission. On Apollo 17, these were Eugene A. Cernan (Mission Commander), Harrison H. Schmitt (Lunar Module Pilot), and Ronald E. Evans (Command module pilot). As the command module remained in lunar orbit, Evans stayed in it while Schmitt and Cernan went to the surface in the Lunar Module (lander).
There are four men who have walked on the moon and are still alive: Buzz Aldrin, David Scott, Charles Duke, and Harrison Schmitt.