William Broyles Jr. (born October 8, 1944) is an American screenwriter, who has worked on the television series China Beach, and the films Apollo 13, Cast Away, Entrapment, Planet of the Apes, Unfaithful, The Polar Express, and Jarhead. He also assisted in the screenplay of Saving Private Ryan. He was married to the actress Linda Purl from 1988 to 1992. Thereafter, he married Andrea Berndt and had two daughters with her. He was also (first) married to Sybil Newman while at Texas Monthly (where she was art or design director) and she accompanied him to NYC when he became editor of Newsweek.

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