The paintings Grützner is best known for combine detailed academic rendering with humorous and anecdotal subject matter, often depicting monks drinking. He died in Munich in 1925.
Grützner was one of Hitler's favorite painters, Albert Speer quoting him as saying of one of the artist's works that he was "greatly underrated... Believe me, this Grützner will someday be worth as much as a Rembrandt. Rembrandt himself couldn't have painted that better."[1]
Notes
Regarding personal names: Ritter is a title, translated approximately as Knight, not a first or middle name. There is no equivalent female form.