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John Younker Simon (June 25, 1933 - July 8, 2008) was an American Civil War scholar known for editing the papers of Ulysses S. Grant. Born in Highland Park, Illinois, he was on the history faculty of Southern Illinois University Carbondale, for 44 years. Simon had MA and PhD history degrees from Harvard University. He died July 8, 2008 in Carbondale, Illinois.