Came to the United States, 1948, naturalized, 1954. Chief assistant applied mathematics Technology U. Hannover, 1927-1929. From research scientist to head department theoretical aerodynamics Aerodynamic Versuchsanstalt (AVA), Göttingen Germany, 1929-1938.
Science adviwer Deutsche Versuchsanstalt Für Luftfahrt Berlin-Adlershof, 1938-1945. Head research group Office National d’Etudes et de Recherches Aeronautiques, Paris, France, 1946-1948. Member of faculty Stanford, 1949-1974, professor engineering mechanics, aero. and astronautics, 1960-1974.