Who flew on more Space Shuttle missions, meteorologist Piers Sellers or chemical engineer Lodewijk van den Berg?
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-47 STS-47 was the 50th Space Shuttle mission of the program, as well as the second mission of Space Shuttle Endeavour. The mission mainly involved conducting experiments in life and material sciences.