In 1915 Boeke traveled to Berlin, where he met Friedrich Siegmund-Schultze, with whom Hodgkin had been working at the outbreak of war.
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In the German repertoire he had roles in Pfitzner's Palestrina and Das Herz; Schultze's Schwarzer Peter; Eugen d'Albert's Tiefland, Goetze's Widerspenstigen Zähmung, Jokanaan in Richard Strauss's Salome, and others.
Henry Schultze (1893 – 1959) was an American academic and former president of Calvin College in Grand Rapids, Michigan.
After returning to base, Schultze gave an interview to William L. Shirer, an American reporter, on 29 September 1939.
Again, in 1878, he endeavoured to make clear the respective merits of Schultze and black powder, when, besides conducting the actual competition, he himself carried out numerous experiments.
After several projects as production manager at Telefunken, Schultze decided in 1936 to try his luck as a freelance composer for stage and film.