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Brother of actor Ben Affleck Attended Columbia University, majoring in Physics. During this time he lived with his grandma in Manhattan. Currently lives in New York City. Is of Scottish-Irish descent In the March issue of Nylon Magazine, Casey Affleck admits to being ashamed of two movies in his career: Drowning Mona and Soul Survivors. Is a vegan. Best friends with Joaquin Phoenix and lives in the same apartment building. Appeared with brother Ben Affleck in two 1997 movies, Chasing Amy and in Good Will Hunting. His older brother, Ben Affleck, and his fiancée's older brother, River Phoenix, have both played versions of characters played by Harrison Ford. Ben Affleck played Jack Ryan in The Sum of All Fears, and River Phoenix played the young Indy in Indiana Jones and the Last Crusade. He and fiancée Summer Phoenix welcomed a son, Indiana August, on May 31, 2004, in Amsterdam. Brother-in-law of Jennifer Garner, Joaquin Phoenix, Rain Phoenix and Liberty Phoenix. He and Summer Phoenix were a couple for six years before they married