Sean (Justin) Penn, (born Aug. 17, 1960, Santa Monica, Calif., U.S.), U.S. actor and director. He had a series of minor roles before his breakthrough performance in Fast Times at Ridgemont High (1982). Noted for his intensity and versatility, he later starred in such films as Dead Man Walking (1995), Sweet and Lowdown (1999), I Am Sam (2001), Mystic River (2003, Academy Award), Milk (2008, Academy Award), The Tree of Life (2011), and The Professor and the Madman (2019). Penn directed a number of movies, including The Crossing Guard (1995), The Pledge (2001), and Into the Wild (2007). A noted political activist, he was involved in humanitarian causes.
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