Claim: Horst Wenninger was a German physicist who took active part in the TESLA collaboration and retired from CERN in September 2003.
Evidence: Horst Artur Wenninger (1938 - 2020) was a German physicist who spent most of his career at CERN. During his last years of career he also took active part in the TESLA collaboration, which was merged into the International Linear Collider project. He retired from CERN in September 2003.