Brian HelgelandBrian Thomas Helgeland (born January 17, 1961) is an American screenwriter, film producer and director. He is most known for writing the screenplays for ''L.A. Confidential'' (for which he received the Academy Award for Best Adapted Screenplay), ''Mystic River'', and ''A Nightmare on Elm Street 4: The Dream Master''.
Helgeland also wrote and directed ''42'' (2013), a biopic of Jackie Robinson, and ''Legend'' (2015), about the rise and fall of the infamous London gangsters, the Kray twins. Provided by Wikipedia