He was the son of the German painter Christian Jank and specialized in scenes with horses and riders.
For many years, he was also employed as an illustrator for the magazines Jugend and Simplicissimus, And he was also an instructor at the Academy of Fine Arts, where his students included Karl Gatermann the Younger.
In addition to his canvases, he painted murals at the Justizpalast and scenes from history at the Reichstag building in Berlin.
Among his best-known students were Louis Grell, Erma Bossi, Nina Arbore, Franz Xaver Stahl (also an animal painter), Henryk Gotlib, Käte Lassen, Carl Rabus and Adolf Ziegler.
Together, they were the parents of: An affair with the painter, Marie Schnür, produced a son named Klaus.