Samuel Atkinson Waterston (born November 15, 1940) is an American actor, producer, and director. Among other roles, he is noted for his portrayal of Sydney Schanberg in The Killing Fields (1984), for which he received an Academy Award nomination, and his starring role as Jack McCoy on the NBC television series Law & Order (1994–2010), which brought him Golden Globe and Screen Actors Guild Awards. He has been nominated for multiple Golden Globe, Screen Actors Guild, BAFTA, and Emmy awards, having starred in over eighty film and television productions during his fifty-year career. He has also starred in numerous stage productions. AllMovie historian Hal Erickson characterized Waterston as having "cultivated a loyal following with his quietly charismatic, unfailingly solid performances."Waterston received a star on the Hollywood Walk of Fame in 2010 and was inducted into the American Theatre Hall of Fame in 2012.
He is also known as Samuel Atkinson Waterston.