Tom Donahue (pictured left) directed the film, which tracks the last half-century of Hollywood history from the perspective of casting directors like Marion Dougherty and Lynn Stalmaster.
The film premiered at Toronto Monday evening and will screen at the New York Film Festival in October.
Donahue has directed shorts and also edited a bevy of features and TV projects.
“The creation of 'Casting By' was a collaborative process made in the spirit of the late Marion Dougherty to recognize these unsung heroes,” Donahue said in a statement. “We could not be more excited to have found the perfect home for our film at HBO.”
Donahue produced the project with Kate Lacey, Ilan Arboleda and Joanna Colbert.