Brian Thomas Helgeland (born January 17, 1961) is an American screenwriter, film producer, and director. He is best known for writing the screenplays for the films L.A. Confidential (1998) and Mystic River (2003). He wrote and directed the films 42, a biopic of Jackie Robinson; and Legend, about the rise and fall of the infamous London gangsters, the Kray twins. His work on L.A. Confidential earned him an Academy Award for Best Adapted Screenplay.

Description above from the Wikipedia article about Brian Helgeland, licensed under CC-BY-SA, full list of contributors on Wikipedia.