During the 1920s, he worked as a correspondent for the Argentine newspaper La Nación.
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From a philosophical standpoint, Buek was an advocate of Neo-Kantianism, and as a young man was a disciple of Marburg philosopher Hermann Cohen (1848-1918).
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Additionally, with Kurt Wildhagen (1871-1949), he edited works by Turgenev, Gogol and two volumes of Ernst Cassirer's edition of Kant's collected writings.
When 93 German intellectuals signed the Aufruf an die Kulturwelt manifesto in support of the war, Foerster was one of only four intellectuals to sign the Aufruf an die Europäer counter-manifesto (the others were Albert Einstein, the philosopher Otto Buek, and its author, the physiologist Georg Friedrich Nicolai).
Otto von Bismarck | Otto | Otto III | Otto Piene | Otto I, Holy Roman Emperor | Otto I | Otto Preminger | Otto II | Otto Dix | Otto Natzler | Otto II, Holy Roman Emperor | Otto Binder | Otto Skorzeny | Otto Schenk | Otto of Brunswick | Otto Kerner, Jr. | Otto Steinbrinck | Otto Kerner | Otto IV, Holy Roman Emperor | Otto IV | Otto III, Holy Roman Emperor | Otto Braun | Miranda Otto | Frei Otto | Otto-Werner Mueller | Otto Schmidt | Otto Muehl | Otto Lilienthal | Otto Klemperer | Otto Hermann Kahn |