Angelina Jolie will direct the World War II thriller in which Jack O'Connell will play Louis Zamperini, an Olympic runner taken prisoner by Japanese forces. Wittrock has been cast as a solder in his outfit.
"Unbroken" was written by Joel and Ethan Coen, along with William Nicholson.
Wittrock also appeared Off-Broadway in The Illusion and The Age of Iron. He is currently shooting Ryan Murphy's film adaptation of Larry Kramer's drama The Normal Heart.