Claude Nicollier and André Kuipers were both astronauts of which space agency?
Claude Nicollier:  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). André Kuipers: André Kuipers (] ; born 5 October 1958) is a Dutch physician and ESA astronaut.
ESA