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Ernest Julius Wilczynski (November 13, 1876–September 14, 1932) was an American mathematician considered the founder of projective differential geometry.
Born in Hamburg, Germany, Wilczynski's family emigrated to America and settled in Chicago, Illinois when he was very young. He attended public school in the US but went to college in Germany and received his PhD from the University of Berlin in 1897. He taught at the University of California until 1907, the University of Illinois from 1907 to 1910, and the University of Chicago from 1910 until illness forced his absence from the classroom. His doctoral students include Archibald Henderson, Pauline Sperry and Ellis Stouffer.
- "Ernest Julius Wilczynski." Dictionary of American Biography. New York: Charles Scribner's Sons, 1936. Gale Biography In Context. Web. 14 Feb. 2011.