Has Piers Sellers or Hans Schlegel been on more Space Shuttle Missions?
Piers Sellers Piers John Sellers OBE (11 April 1955 – 23 December 2016) was a British-American meteorologist, NASA astronaut and Director of the Earth Science Division at NASA/GSFC. He was a veteran of three space shuttle missions.
STS-68 STS-68 was a human spaceflight mission using "Endeavour" that launched from Kennedy Space Center, Florida on 30 September 1994.