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.
Kathryn P. Hire Kathryn Patricia "Kay" Hire (born August 26, 1959 in Mobile, Alabama) is a NASA astronaut and Captain in the U.S. Navy Reserve who has flown aboard two Space Shuttle missions.