Caleb Casey McGuire Affleck-Boldt (born August 12, 1975), best known as Casey Affleck is an American actor and film director. Throughout the 1990s and early 2000s, he played supporting roles in mainstream hits like Good Will Hunting (1997) and Ocean's Eleven (2001) as well as in critically acclaimed independent films such as Chasing Amy (1997). During this time, he became known as the younger brother of actor and director Ben Affleck, with whom he has frequently collaborated professionally. In 2007, his breakout year, Affleck gained recognition and critical acclaim for his work in Gone Baby Gone and The Assassination of Jesse James by the Coward Robert Ford, which gained him an Academy Award nomination for Best Supporting Actor.
Affleck was born in Falmouth, Massachusetts. He is the second son of Christine Anne "Chris" (née Boldt), a school district employee and teacher, and Timothy Byers Affleck, a drug counselor, social worker, janitor, auto mechanic, bartender, and former actor with the Theater Company of Boston. Affleck has Irish, Scottish, German and English ancestry, and is a distant cousin of actor Matt Damon. He was raised in a mostly Episcopalian family. Affleck is three years younger than his brother Ben Affleck. As a child he had numerous pets, including cats, snakes, guinea pigs and turtles. Affleck went to George Washington University and later transferred to Columbia University in New York City, where he majored in physics, astronomy, and Western philosophy, but never graduated. Affleck worked sporadically on television while finishing high school and attending college during the early 1990s.