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Kaspar Heinrich Merz was a Swiss draftsman and copper and steel engraver. From 1821, with the help of "a few patrons", he was "apprenticed" to the copper engraver Johann Jakob Lips in Zurich for four years. He also worked as an engraver for the magazine Historical Entertainment. Merz had also acquired a reputation for his color engravings, some of which he created over years of individual work.
Karl Hofer was a German expressionist painter. He was director of the Berlin Academy of Fine Arts.
One of the most prominent painters of expressionism, he never was a member of one of the expressionist painting groups, like "Die Brücke", but was influenced by their painters. His work was among those considered degenerate art by the Nazis, but after World War II he regained recognition as one of the leading German painters.