Louis G. Dunn , born in South Africa, earned a B.S. (1936), two M.S.s--in mechanical engineering (1937) and aeronautical engineering (1938)--and a Ph.D. (1940) from Caltech and then joined the faculty there. He became assistant director of the Jet Propulsion Laboratory in 1945-1946 and its director from 1947-1954, presiding over its early program in rocketry leading up to the development of the Sergeant missile. He left JPL to take over the beginning Atlas missile project for the recently-formed Ramo-Wooldridge Corporation. He remained there through 1957 as associate director and then director and vice president of the guided missile research division, before becoming executive vice president and general manager, then president, and finally chairman of the firm's Space Technology Laboratories. He left the firm in 1963 to assume various management positions for Aerojet-General Corporation. Besides the Atlas (built by General Dynamics), he played a key role in developing the Thor (McDonnell Douglas), the Titan and Minuteman missiles (Martin Marietta).