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.
Ken Bowersox Kenneth Dwane "Sox" Bowersox (born November 14, 1956) is a United States Navy officer, and a former NASA astronaut. He is a veteran of five Space Shuttle missions and an extended stay aboard the International Space Station.