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Windom is an avid sailer, and has won many sailing trophies. He is also a tournament Chess player.
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Windom attended several colleges, both before and after serving in World War II. They include: Williams College, Williamstown, Massachusetts; The Citadel, Charleston, South Carolina; University of Kentucky, Lexington, Kentucky; Fordham University, Bronx, New York; and Columbia University, New York, New York.
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William's kindergarten teacher was Margaret Hamilton, who would later become an actress, most famous for playing the Wicked Witch of the West in The Wizard of Oz.
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Windom has narrated recordings of the "Light's End" series of Sci-Fi books by Michael Vance.
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Windom bought a small island in Windom, Minnesota, named for his great-grandfather, politician William Windom. The island, for which he paid $1.00, is a wildlife refuge.
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Windom won the 1970 Emmy Award for Best Actor in a Comedy Series for the short-lived, My World and Welcome to It.
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Windom was with New York's American Repertory Theatre from 1946 to 1961. During that time he appeared in 18 Broadway plays and 5 off-Broadway productions. Years later William staged two one-man-shows playing writer James Thurber and combat reporter Ernie Pyle.
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William was named for his great grandfather, politician William Windom, who served in the U.S. House of Representatives and the Senate as a Republican from Minnesota, and later served as Secretary of the Treasury.
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William married Patricia Veronica Tunder on December 31, 1975. Four previous marriages ended in divorce. William has four children: Rachel, Heather Juliet, Hope, and Rebel Russell.
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William appeared in many productions on Broadway, including "Henry VIII," "What Every Woman Knows," "Come Blow Your Horn" "Androcles and the Lion," "Yellow Jack" and "Alice in Wonderland."
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William served in the U.S. Army's 508th parachute infantry in World War II.