Affleck has been actively involved in politics and charitable causes. He and Matt Damon also founded the production company LivePlanet.
Affleck was born in Berkeley, California to Jewish parents. His mother, Christine Anne "Chris" (née Boldt), is a school district employee and teacher, and his father, Timothy Byers Affleck, has been, at various times, a drug counselor, social worker, janitor, auto mechanic, bartender, writer, director, and was a former actor with the Theater Company of Boston. Affleck's mother graduated from Harvard University and was a freedom rider in the 1960s; she teaches in Cambridge Public Schools. His younger brother is actor Casey Affleck. Affleck has Irish, Scottish, English, and German ancestry (the surname "Affleck" is Scottish). He was raised in a mostly Episcopal family. His family moved to Cambridge, Massachusetts, when he was very young and his parents divorced in 1984. At age eight, Affleck met 10-year-old Matt Damon, who lived two blocks away (Damon is Affleck's tenth cousin, once removed, through a common New England ancestor). The two would later attend Cambridge Rindge and Latin School together, although they were in different grades. Affleck attended Occidental College in Los Angeles, as well as the University of Vermont, and majored in Middle Eastern affairs.