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Martin A. Ryerson (1856–1932) was an American, lawyer, businessman, philanthropist and art collector. Heir to a considerable fortune, he was a lumber manufacturer and corporate director. He became the richest man in Chicago by the age of 36. A long-time trustee of the University of Chicago, he made large charitable contributions for the construction of buildings on campus. He bequeathed his extensive art collection to the Art Institute of Chicago.