From 1922 to 1937 Caspar was a professor at the Academy of Fine Arts in Munich. His works were exhibited in the Degenerate Art Exhibition, which was organized in Munich by the Nazis in 1937. Thereafter, his Christianity-inspired paintings and drawings, influenced equally by Impressionism and Expressionism, were removed from German museums and public collections and/or destroyed, and he was forced to retire from his teaching position. That same year (some sources say the year was 1944, after his Munich house was destroyed in a bombing raid), due to Nazi hostility, he settled with his family in Brannenburg, where he is buried.
^"02209 Karl Caspar". Matrikelbuch 1884-1920 (in German). Retrieved February 1, 2014.
References
Wirth, Günther, ed. (1993). Maria Caspar-Filser - Karl Caspar. Verfolgte Bilder [Maria Caspar-Filser - Karl Caspar. Persecuted images.] (in German). Albstadt: City Gallery. ISBN3-923644-53-1.
Köster, Karl Theodor; Köster-Caspar, Felizitas E. M., eds. (1985). Karl Caspar. Das druckgraphische Werk. Gesamtverzeichnis [Karl Caspar. His printmaking work. Complete index.] (in German). Sigmaringen: Released on the occasion of the exhibition "Karl Caspar: His printmaking work" in Langenargen Museum. ISBN3-7995-3157-2.