In the academic year 1958–1959 he was at the University of Chicago, became in 1959 an associate professor and subsequently professor at the University of Minnesota and was from 1964 a professor at the University of California, San Diego.
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as annotator and editor: Adolf Hurwitz, Richard Courant Lehrbuch der Funktionentheorie, Springer Verlag, 4th edn.
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In 1964 he edited the new edition of the classic textbook on function theory by Adolf Hurwitz and Richard Courant.
Helmut Lachenmann | Helmut Kohl | Helmut Newton | Helmut Schmidt | Helmut Jahn | Helmut Reichelt | Helmut Berger | Walter Röhrl | Helmut Werzer | Helmut Oehring | Helmut Lang | Helmut Käutner | Helmut Zahn | Helmut Reichmann | Helmut Krone | Helmut Grunsky | Helmut Benthaus | Helmut Sonnenfeldt | Helmut Schwarz | Helmut Schreyer | Helmut Rahn | Helmut Oberlander | Helmut Michel | Helmut Metzner | Helmut Markwort | Helmut Landsberg | Helmut Krausser | Helmut Horten | Helmut Herbst | Helmut Hasse |