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 |
Awarded a scholarship by the Council for the Extension of Studies and Scientific Research he studied in the nervenklinik (mental hospital) of the University of Vienna (1933–34) on clinic neurology and animal testing with H. Hoff, on brain cytoarchitecture with Otto Pötzl in the laboratory of Constantin von Economo, and on brain pathology in the mental hospital of the Goethe University Frankfurt (1934–35) with Karl Kleist.