Wernher von Braun
Von Braun arrived at Peenemünde in July 1943 at the request of Wernher von Braun. In March 1944 he was arrested with fellow rocket specialists Wernher von Braun, Klaus Riedel, Helmut Gröttrup, and Hannes Lüersen, but was later released. In late summer 1944 he transferred to the Mittelwerk where he engineered V-2 rocket gyroscopes, servomotors, and turbopumps.