Sam Waterston
Samuel Atkinson "Sam" Waterston (born November 15, 1940) is an American actor and occasional producer and director. Among other roles, he is noted for his Academy Award-nominated portrayal of Sydney Schanberg in 1984's The Killing Fields, and his Golden Globe- and Screen Actors Guild Award-winning portrayal of Jack McCoy on the NBC television series Law & Order. 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 forty-five year career. Allmovie has characterised Waterston as having "cultivated a loyal following with his quietly charismatic, unfailingly solid performances." Description above from the Wikipedia article Sam Waterston, licensed under CC-BY-SA, full list of contributors on Wikipedia.
Known for
Miss Sloane 
The Newsroom 
The Six Triple Eight 
On the Basis of Sex 
Godless 
Hannah and Her Sisters 
The Killing Fields 
Crimes and Misdemeanors 
Grace and Frankie 
Serial Mom 
The Great Gatsby 
Capricorn One 
Interiors 
The Civil War 
The Man in the Moon 
Heaven's Gate 
September 
Hopscotch 
Shadow Conspiracy 
Anesthesia 
Jane Fonda in Five Acts 
Swimming to Cambodia 
The Enemy Within 
The Matthew Shepard Story 
Kurt Vonnegut: Unstuck in Time 
Exiled 
Just Between Friends 
Merchant Ivory 
The Room Upstairs 
The Man in the Woods 
Dean Smith 
The Plastic Dome of Norma Jean