Norway's leading academic contemporaries on issues of genetics and heredity such as Kristinne Bonnevie, Otto Lous Mohr Kristian & Alette Schreiner belonged to his academic circle.
During the German occupation of Norway he was arrested by the Nazi authorities on 11 September 1941, together with Didrik Arup Seip and Anton Wilhelm Brøgger.
Otto von Bismarck | Otto | Otto III | Otto Piene | Otto I, Holy Roman Emperor | Otto I | Otto Preminger | Jay Mohr | 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 |