Interview with Marshall H. Cohen

Interview with Marshall H. Cohen, Caltech Professor of Astronomy, emeritus, by Shelley Erwin in six sessions and a supplement, 1996-1997, and 1999. He talks about his youth, family background, and education, and his early interest in electrical gadgets; wartime work for Westinghouse; higher education at Ohio State University: bachelor’s degree, electrical engineering, 1948; PhD in physics, 1952. Reminiscences of the Ohio State Antenna Lab and Vic Rumsey, 1952-1954. Following appointment at Cornell in electrical engineering, Cohen describes his transition to the new field of radio astronomy. Recalls early participants in the field: J. Greenstein, F. Whipple, M. Ryle, B. Lovell, R. Hanbury Brown, E. G. Bowen, J. Bolton, P. Wild, W. Christiansen; British and Australian competition in interferometry; Caltech’s early entry in the field. Brief interlude recalls Richard Feynman both at Cornell and later at Caltech. Recalls establishment of National Radio Astronomy Observatory (NRAO), Green Bank, West Virginia; later sites in New Mexico. Cohen’s involvement with ionospheric physics and building of Arecibo telescope in Puerto Rico. Recalls scientific work and political battles over Arecibo; colleagues E. Salpeter, T. Gold, B. Gordon. Cohen’s move to UC San Diego, 1966, and soon after, recruitment to Caltech, 1968. He recalls the developments of the 1960s: first US interferometer in Owens Valley; competition for buildings very large arrays; the Greenstein decadal committee (1970)