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In December 1977, ESA named physicist Merbold of the Max Planck Institute in West Germany, physicist Wubbo Ockels of The Netherlands, and astrophysicist Claude Nicollier of Switzerland as payload specialist candidates for the first Spacelab mission.
Source: https://www.aerotechnews.com/blog/2023/11/28/40-years-ago-sts-9-the-first-spacelab-science-mission/