Jacob Benjamin Gyllenhaal ( JIL-ən-hawl, Swedish: [ˈjʏ̂lːɛnˌhɑːl]; born December 19, 1980) is an American actor. Born into the Gyllenhaal family, he is the son of director Stephen Gyllenhaal and screenwriter Naomi Foner, and the younger brother of actress Maggie Gyllenhaal. He began acting as a child, making his acting debut in
City Slickers (1991), followed by roles in his father's films
A Dangerous Woman (1993) and
Homegrown (1998). His breakthrough roles were as Homer Hickam in
October Sky (1999) and as a psychologically troubled teenager in
Donnie Darko (2001). Gyllenhaal starred in the 2004 science fiction disaster film
The Day After Tomorrow. He played Jack Twist in Ang Lee's 2005 romantic drama
Brokeback Mountain<..."> ()