The film is being produced by Phillips and Bradley Cooper under their Joint Effort banner, and Emma Tillinger Koskoff.
Phillips (The Hangover trilogy) directs from a screenplay he co-wrote with writer Scott Silver (The Fighter), based on characters from DC.
Director Todd Phillips has shared a new Joker poster and announced that a teaser trailer for the movie, starring Joaquin Phoenix as the titular villain/Arthur Fleck, will be arriving tomorrow.
Joker is set for release October 4 and will be distributed worldwide by Warner Bros. Pictures.