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Samuel Atkinson "Sam" Waterston (born November 15, 1940) is an American actor, producer, and director. He is best known for playing Executive Assistant District Attorney Jack McCoy in Law & Order, and also for playing Sydney Schanberg in the 1984 movie The Killing Fields. He won a Screen Actors Guild Award for his work on Law & Order. He has also been nominated for an Emmy Award and a Golden Globe Award for that show. He has won other awards, too. He has also been nominated for a lot of awards.