The composition of the Foundation's first Board of Director's, per John D. MacArthur's will, included J. Roderick MacArthur, Catherine T. MacArthur (his second wife), his attorney William T. Kirby, two officers of Bankers Life and Casualty, and Radio Commentator Paul Harvey.
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He started the Bradford Exchange which by the time of his death sold about 90% of all the collectable plates in the world.
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Rod MacArthur married Christiane L'Entendart in Paris in 1947 and had a daughter and two sons, one of them the publisher and president of Harper's Magazine, John R. "Rick" MacArthur.
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During World War II he joined the American Field Service, serving with the French Army in the ambulance corp., and he participated in the campaign that liberated France.
MacArthur first married the former Louise Ingals and had two children: a son, U.S. businessman and philanthropist, J. Roderick MacArthur (1920–1984) and a daughter, Virginia MacArthur.
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John R. MacArthur, the president of Harper's Magazine and son of J. Roderick MacArthur, is a grandson of John D. MacArthur.