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Scope and Content Aerospace engineer, specialist in hypersonic and reentry aerodynamics and a pioneer in the development of hypersonic research aircraft such as the X-15. Received B.S. (1935, mechanical engineering) and M.S. (1936, aeronautical engineering) degrees from New York University. Joined the Langley Aeronautical Laboratory of the National Advisory Committee for Aeronautics (NACA) as a research engineer in 1936. Head of the 16-ft. Wind Tunnel Branch (1943-1947), chief of the Compressibility Research...