Claim: Konstantin Feoktistov (who earned a doctorate in physics) joined Mikhail Tikhonravov's OKB (design bureau) and was the first civilian to make a space flight by spending over 24 hours and 17 minutes in space.
Evidence: Feoktistov also later earned a doctorate in physics. He joined Mikhail Tikhonravov's OKB (design bureau), and in 1955, Feoktistov formed part of the team that went on to design the Sputnik satellites, the Vostok space capsule, the Voskhod space capsule, and the Soyuz space capsule under the leadership of the Soviet Chief Designer Sergey Korolev. He was the first civilian to make a space flight, and the only cosmonaut in the Soviet Union who was not a member of the Communist Party of the Soviet Union. During his space flight, he spent just over 24 hours and 17 minutes in space.