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.
STS-68 STS-68 was a human spaceflight mission using "Endeavour" that launched from Kennedy Space Center, Florida on 30 September 1994.