Who flew on more Space Shuttle missions, meteorologist Piers Sellers or chemical engineer Lodewijk van den Berg?
Lodewijk van den Berg Lodewijk van den Berg (] ; born March 24, 1932) is a Dutch American chemical engineer, specializing in crystal growth, who flew on a 1985 Space Shuttle "Challenger" mission as a Payload Specialist.
Mark T. Vande Hei Mark Thomas Vande Hei (born November 10, 1966) is a current NASA astronaut selected in 2009, who launched to the International Space Station on September 12, 2017 for his first spaceflight.