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Jacob Benjamin Gyllenhaal is an American actor who has worked prolifically on screen and stage in a career spanning over thirty years. Born into the Gyllenhaal family, he is the son of film 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 the biographical drama film October Sky (1999) and as a psychologically troubled teenager in the thriller film Donnie Darko (2001). Gyllenhaal expanded to big-budget films with a starring role in the 2004 disaster film The Day After Tomorrow. Wikipedia