Who flew on a 1985 Space Shuttle "Challenger" mission as a Payload Specialist, Claude Nicollier or  Lodewijk van den Berg?
Claude Nicollier Claude Nicollier (born 2 September 1944 in Vevey, Switzerland) is the first astronaut from Switzerland. He has flown on four Space Shuttle missions. His first spaceflight (STS-46) was in 1992, and his final spaceflight (STS-103) was in 1999. He took part in two servicing missions to the Hubble Space Telescope (called STS-61 and STS-103). During his final spaceflight he participated in a spacewalk, becoming the first European Space Agency astronaut to do so during a Space Shuttle mission (previous ESA astronauts conducted spacewalks aboard "Mir", see List of spacewalks and moonwalks 1965–1999). In 2000 he was assigned to the Astronaut Office Extravehicular Activity Branch, while maintaining a position as Lead ESA Astronaut in Houston. Nicollier retired from ESA in April 2007.
Andrew J. Feustel Andrew Jay "Drew" Feustel ( ; born August 25, 1965) is an American geophysicist and a NASA astronaut. His first spaceflight in May 2009, STS-125, lasted just under 13 days. This was a mission with six other astronauts to repair the Hubble Space Telescope, aboard Space Shuttle "Atlantis". Feustel performed three spacewalks during the mission. Following several years working as a geophysicist, Feustel was selected as an astronaut candidate by NASA in July 2000. His second spaceflight was STS-134, which launched on May 16, 2011 and landed on June 1, 2011; that mission was the penultimate Space Shuttle flight.