After returning to Europe in October 1908 aboard the Empress of Britain, Kaufmann continued his career as a guide to the high peaks in the Bernese Oberland. In August 1909, for instance, he and his half-brother Rudolf guided W. S. Jackson from Toronto, Canada, to the summits of the Mönch and Fiescherhorn. Jackson, who was classics professor at Upper College, had written the climbing notes on the Rockies in Baedeker's Canada (1907). In 1909, 1911, and 1913, Adolf A. Friedländer, professor of psychiatry at the Hohe Mark Klinik in Frankfurt a/M, climbed a range of mountains (Wetterhorn, Mönch, Zäsenberg, Beithorn, Jungfrau, Schreckhorn, and Finsteraarhorn) with Kaufmann; the man, who had major disagreements with Sigmund Freud, developed great respect for Kaufmann, saying he admired his first-class fortitude, caution, resolve, and confidence as a guide, whether it was in good weather or fog, rain or snow. Oskar Eliel (1878-1939), an active supporter of Jewish rights during the rise of Nazism, and his wife climbed the Wetterhorn and the Jungfrau with Kaufmann in September 1919.