Born in Mamaroneck, New York, Dillon was known for playing tough guys and bad boys early in his career. His first major role was Rooney, the bully in the brilliant (though much understated) film Heaven Help Us, directed by Michael Dinner.
Dillon has since starred in many memorable films, most notably Oliver Stone’s Platoon and The Doors, the World War II film A Midnight Clear, No Escape and the cult classic The Blob. He was nominated for a Young Artist Award for his poignant performance opposite Glenn Close, James Woods and Mary Stuart Masterson in Immediate Family. Dillon starred opposite Kurt Russell and Richard Dreyfuss in Wolfgang Petersen’s Poseidon for Warner Brothers and opposite Lisa Kudrow, Don Cheadle and Emma Roberts in Hotel for Dogs for Dreamworks, directed by Thor Freudenthal.
On television, Dillon’s hilarious, yet heartfelt portrayal of the beloved Johnny Drama on HBO’s hit series Entourage, garnered him nominations for three Emmys, a Golden Globe and three SAG Awards. Additionally, he had recurring roles on the critically acclaimed series NYPD Blue, 24 and most recently on the hit series Blue Bloods for CBS. He reprised his role as Johnny Drama in the Warner Brothers feature film Entourage, directed by Doug Ellin. Dillon will next be seen in the film Buddy Games starring opposite Josh Duhamel, Dax Shepard and Oliva Munn, directed by Duhamel.