Dryden, Prandt, von Kármán, and Tsien

A now historic picture taken in Germany in 1945 when von Kármán headed a technical mission to Europe as director of the Army Air Force Scientific Advisory Group. Left to right: Hugh Dryden, later Deputy Director of NASA; Ludwig Prandt, von Kármán’s teacher at Göttingen, von Kármán; H. S. Tsien, leading U.S. rocket expert.