As an actor, Josh is best known for his groundbreaking portrayal of Private Roger Horn in the acclaimed CBS television series Tour of Duty. Josh was born and raised in New Jersey, growing up in the town of West Orange. Josh began his professional training with Academy Award winner Olympia Dukakis and then received his B.A. from Sarah Lawrence College in history and drama. He later went on to star in a number of television movies and films. Novelist Paul Auster is his cousin.

Filmography