Interview discusses, not in chronological order: early home life and schooling; undergraduate at Leiden, influence of Paul Ehrenfest, Jan H. Oort, Jacobus C. Kapteyn, Gerard Kuiper, Antonie Pannekoek, Ejnar Hertzsprung. Recollections of work of Georg Uhlenbeck and Samuel Goudsmit. Assistant to Peter van Rhijn at Groningen ca. 1928, work on various stellar and galactic topics. Move to Harvard, 1929, and atmosphere there under Harlow Shapley. Marriage to Priscilla Fairfield Bok; her contacts with William W. Campbell. Search for and interpretation of spiral auras of our galaxy; studies of stellar density distribution. Activities during World War II. Harvard astronomy group's difficult postwar transition; McCarthyism. Work on nebulae and globules. Comments on astronomy at Mt. Wilson, Tonantziutla, and South Africa. Origins of Harvard radio astronomy and National Radio Astronomy Observatory, and their funding. Move to Australia, 1956, and conditions there. Move to Steward Observatory of University of Arizona, 1964, and conditions there. Location of national observatory at Kitt Peak; management of Kitt Peak. Discussions of astronomy, education, popularization, employment, and organization. Also prominently mentioned are: Wilhelm Heinrich Walter Baade, McGeorge Bundy, Edwin F. Carpenter, Tom Cherry, James Bryant Conant, Arthur Stanley Eddington, Sergei Gaposchkin, Jesse Leonard Greenstein, Haro, David Heeschen, Ejnar Hertzsprung, James Jeans, Ivan Robert King, Bertil Lindblad, Antonia Maury, Nicholas Ulrich Mayall, Joseph McCarthy, Sidney McCuskey, Aden Meinel, Donald Howard Menzel, Robert Menzies, James E. Miller, Edward Arthur Milne, William Wilson Morgan, Edward Charles Pickering, Harry Hemley Plaskett, Nathan Pusey, Martin Schwarzschild, Willem de Sitter, Otto Struve; American Astronomical Society, Associated Universities for Research in Astronomy, Associated Universities, Inc., Boyden Observatory, Case Institute of Technology, Harvard College Observatory, Harvard Series on Astronomy, Indiana University, Mount Stromlo Observatory, National Science Foundation (U.S.), Ohio State University, Princeton University, Rijksuniversiteit te Groningen, Rijksuniversiteit te Leiden, University of Arizona, University of Illinois, University of Michigan, and University of Texas.

Life of his father, Karl Schwarzschild; father's scientific relationships in Göttingen (Felix Klein, David Hilbert); move to Potsdam, 1909; relations with Potsdam and Berlin scientists (Albert Einstein, Karl Sommerfeld); father's Jewish background concealed. M. Schwarzschild's youth in Göttingen and Berlin; early education, interest in astronomy and mathematics. Undergraduate at Göttingen Universität (Hans Kienle, Richard Courant, Neugebauer), 1930-1933; graduate work at Gottingen Observatory, 1933-1935; his reaction to Nazism. Introduction to astrophysics (Arthur Eddington), interest in stellar interiors and stellar evolution; contacts with other astronomers from Gottingen Observatory (Otto Heckmann, Kienle, Rupert Wildt); comments on general relativity; interest in pulsating stars; leaves Göttingen, 1936. Postdoctorate at Oslo (Svein Rosseland); Jan Oort, Ejnar Hertzsprung; mechanical analog computer for computations in astrophysics and celestial mechanics; comments on development of theory of stellar interiors, 1939-1950. To Harvard College Observatory (Harlow Shapley), 1938; C. Payne-Gaposchkin, Bart Bok; comparison of European and American observational style, social scene; Barbara Schwarzschild's difficulties as female astronomer; contacts with S. Chandrasekhar and other astronomers. Tour of the United States; visits Mt. Wilson Observatory (Wilhelm Baade, Rudolph Minkowski, Edwin Hubble, Milton Humason), 1940; Shapley's relationship with Mt. Wilson staff. Harvard (Fred Whipple), 1938-1941; Shapley as a leader; astronomy summer school at Harvard; work on Cepheid variables in M3 (Bok, Chandrasekhar); overall impact on Schwarzschild of Harvard period. Columbia University (Jan Schildt, I. I. Rabi), 1940-1942; difficulties there; origin and funding of Thomas Watson Astronomical Computing Center; discussion of cosmology in the late 1930s; contacts with physicists (Enrico Fermi). In U.S. Army, 1941-1945; enters as private, teaches math to recruits; refuses invitation to Los Alamos; transferred to Aberdeen Proving Ground, dissatisfaction there; to officers training school, does bombing analysis for Italian campaign. Work relating to stellar interiors and evolution, 1938-1946; nuclear energy source ideas (Hans Bethe, Fermi); Eddington, Gerard Kuiper, Chandrasekhar, G. Keller; German astronomers during World War II (Ludwig Biermann). Discussion of wife's career and her role in his career. Early ideas about red giants (Öpik, Herman Bondi, Fred Hoyle), 1946-1950. Work on acoustic wave energy transport (R. Richardson, Gold); work on chemical composition differences in stellar populations. To Princeton University (Spitzer, H. N. Russell), 1947; Project Matterhorn (start of bomb and fusion projects); relationship with Russell. Stellar evolution work in the 1950s; computer work (John Von Neumann, Richard Härm), mid-1950s; collaboration with Allan Sandage evolving a stellar model, 1952; computing towards red giants; observational cluster work, 1951; ages, metallicity, and the Big Bang; beginnings of "astrophysical" cosmology. Evolution theory after late 1950s; effect of computers on theoretical progress; relation of evolution theory to cosmology; general comments on his work in stellar evolution; interactions with Robert Dicke; views on cosmology, general relativity. Need for better solar convection work leads to use of balloons (James Van Allen); post-Sputnik funding; on cooperation with industry and engineers; Stratoscope II (Bob Danielson, Spitzer). Years advising the National Science Foundation, President's Science Advisory Committee, 1959-1976, and National Aeronautics and Space Administration (Von Neumann), to 1969; The International Astronomical Union, 1964-1970; American Asronomical Society, 1967-1973. Informal advisor to various observatories: Kitt Peak National Observatory, Mt. Wilson-Palomar Observatories, Carnegie Southern Observatory. Recent work on galactic structure. Reflects on importance of ethical standards; his feelings about religion and nature.

Life of his father, Karl Schwarzschild; father's scientific relationships in Göttingen (Felix Klein, David Hilbert); move to Potsdam, 1909; relations with Potsdam and Berlin scientists (Albert Einstein, Karl Sommerfeld); father's Jewish background concealed. M. Schwarzschild's youth in Göttingen and Berlin; early education, interest in astronomy and mathematics. Undergraduate at Göttingen Universität (Hans Kienle, Richard Courant, Neugebauer), 1930-1933; graduate work at Gottingen Observatory, 1933-1935; his reaction to Nazism. Introduction to astrophysics (Arthur Eddington), interest in stellar interiors and stellar evolution; contacts with other astronomers from Gottingen Observatory (Otto Heckmann, Kienle, Rupert Wildt); comments on general relativity; interest in pulsating stars; leaves Göttingen, 1936. Postdoctorate at Oslo (Svein Rosseland); Jan Oort, Ejnar Hertzsprung; mechanical analog computer for computations in astrophysics and celestial mechanics; comments on development of theory of stellar interiors, 1939-1950. To Harvard College Observatory (Harlow Shapley), 1938; C. Payne-Gaposchkin, Bart Bok; comparison of European and American observational style, social scene; Barbara Schwarzschild's difficulties as female astronomer; contacts with S. Chandrasekhar and other astronomers. Tour of the United States; visits Mt. Wilson Observatory (Wilhelm Baade, Rudolph Minkowski, Edwin Hubble, Milton Humason), 1940; Shapley's relationship with Mt. Wilson staff. Harvard (Fred Whipple), 1938-1941; Shapley as a leader; astronomy summer school at Harvard; work on Cepheid variables in M3 (Bok, Chandrasekhar); overall impact on Schwarzschild of Harvard period. Columbia University (Jan Schildt, I. I. Rabi), 1940-1942; difficulties there; origin and funding of Thomas Watson Astronomical Computing Center; discussion of cosmology in the late 1930s; contacts with physicists (Enrico Fermi). In U.S. Army, 1941-1945; enters as private, teaches math to recruits; refuses invitation to Los Alamos; transferred to Aberdeen Proving Ground, dissatisfaction there; to officers training school, does bombing analysis for Italian campaign. Work relating to stellar interiors and evolution, 1938-1946; nuclear energy source ideas (Hans Bethe, Fermi); Eddington, Gerard Kuiper, Chandrasekhar, G. Keller; German astronomers during World War II (Ludwig Biermann). Discussion of wife's career and her role in his career. Early ideas about red giants (Öpik, Herman Bondi, Fred Hoyle), 1946-1950. Work on acoustic wave energy transport (R. Richardson, Gold); work on chemical composition differences in stellar populations. To Princeton University (Spitzer, H. N. Russell), 1947; Project Matterhorn (start of bomb and fusion projects); relationship with Russell. Stellar evolution work in the 1950s; computer work (John Von Neumann, Richard Härm), mid-1950s; collaboration with Allan Sandage evolving a stellar model, 1952; computing towards red giants; observational cluster work, 1951; ages, metallicity, and the Big Bang; beginnings of "astrophysical" cosmology. Evolution theory after late 1950s; effect of computers on theoretical progress; relation of evolution theory to cosmology; general comments on his work in stellar evolution; interactions with Robert Dicke; views on cosmology, general relativity. Need for better solar convection work leads to use of balloons (James Van Allen); post-Sputnik funding; on cooperation with industry and engineers; Stratoscope II (Bob Danielson, Spitzer). Years advising the National Science Foundation, President's Science Advisory Committee, 1959-1976, and National Aeronautics and Space Administration (Von Neumann), to 1969; The International Astronomical Union, 1964-1970; American Asronomical Society, 1967-1973. Informal advisor to various observatories: Kitt Peak National Observatory, Mt. Wilson-Palomar Observatories, Carnegie Southern Observatory. Recent work on galactic structure. Reflects on importance of ethical standards; his feelings about religion and nature.

Childhood on Missouri farm, early education and interest in science. Enters University of Missouri, 1907; B.A., 1910, M.A., 1911; influence of Oliver Kellogg, Eli Haines, Frederick Seares. To Princeton University, 1911-1914; first doctoral student of Henry Norris Russell; close relationship with Russell, impressions of him as teacher, co-worker, and friend; works on orbits of eclipsing binaries and Cepheid variable star theory; Russell’s experiments with darkening at the limb; Shapley’s research methods, requirements for doctorate in astronomy, 1910; Robert W. Wood, R. S. Dugan, O. W. Richardson, and Annie J. Cannon. Ph.D. on theory of eclipsing binaries, 1913; also works on the velocity of ants in relation to environmental temperature. To Mt. Wilson Observatory (Frederick Seares, Milton Humason, Ferdinand Ellerman, Hale, Walter S. Adams); continues work on globular clusters, eclipsing binaries, pulsation theory; 60-inch and 100-inch telescopes; the personalities and work of J. C. Kapetyn and Adriaan van Maanen; Shapley-Curtis debate on the scale of the universe, 1920. Director of Harvard Observatory, 1921-1951; detailed discussion of reorganization of observatory from research to teaching institution (Harvard University); work on Magellanic Clouds (Henrietta Leavitt, Cannon), early 1920s; his graduate students (Leo Goldberg); photometric and spectra classification for the Henry Draper Catalog; fund-raising activities; move of Harvard Southern Station from to Peru to South Africa; social and intellectual life of the Observatory. Discussion of Shapley’s cultural and philanthropic activities (rescue of European scholars, rebuilding of European observatories and libraries, formation of UNESCO). Discussion of his political activities; the Condon Affair; conflicts with the Rankin and McCarthy committees. Active participation in scientific and scholarly organizations: President of American Academy of Arts and Sciences, 1939-1944; founding of journals, Daedalus and American Scientist; Sigma Xi society; President of American Association for the Advancement of Science; Worcester Foundation for Experimental Biology (Hudson Hoagland, Gregory Pincus); National Science Fund, and National Science Foundation. Reflects on changes in state of astronomy through the years, international relations, funding, and his own career. Also prominently mentioned are: American Astronomical Society, Ants, Arequipa Observatory (Peru), Carthage Academy, Institute for the Study of Religion and the Age of Science, radio astronomy, Rockefeller Foundation, and Tonantzintla Observatory.