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Nelson, Donald Marr (17 November 1888–29 September 1959), business executive and government official, was born in Hannibal, Missouri, the son of Quincy Marr Nelson, a locomotive engineer, and Mary Ann MacDonald. He studied chemical engineering at the University of Missouri, graduating with a B.S. degree in 1911. Shortly thereafter he married Estelle Lord, who died in 1923. In 1926 he married Helen Wishart; they separated in 1940 and were divorced in January 1945. The following month Nelson married his secretary, Marguerite S. Coulbourn; twenty-six years old at the time, she died only two years later, in February 1947. In November 1947 Nelson married Edna May Rowell, but the marriage ended in divorce. He married Lena Peters Schunzel in February 1959. He had no children....