He later served Wilhelm, German Crown Prince as an adjutant during World War I while working as a resident artist at the Berlin Royal Opera where he had a lengthy performance career that spanned from 1906 through 1932.

After retiring from the stage, he taught on the voice faculty of the Klindworth-Scharwenka Conservatory in Berlin, and was also active in that city as a theatre director and talent agent.

[1] He later resumed a military career during World War I, serving as an adjutant to Wilhelm, German Crown Prince while continuing to sing on the Berlin stage.

[1] Kirchhoff studied singing in Berlin with Lilli Lehmann[2] and Eugen Robert Weiss,[3] training under these teachers after being advised to do so by Georg von Hülsen-Haeseler [de].

[2] His other repertoire included Alfonso in Korngold's Violanta, the King's Son in Humperdinck's Königskinder, and Menelaus in R. Strauss's Die ägyptische Helena.

[2] In 1911 he sang the title role in Handel's oratorio Judas Maccabaeus with the Berlin Philharmonic under conductor Siegfried Ochs with a chorus of 600 voices.

[2] In 1922 he portrayed the roles of Siegfried and Loge in the first presentation of the complete Ring cycle at the Teatro Colón in Buenos Aires.