Has Piers Sellers or Hans Schlegel been on more Space Shuttle Missions?
Hans Schlegel Hans Wilhelm Schlegel (Überlingen, 3 August 1951) is a German physicist, an ESA astronaut, and a veteran of two NASA 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.