People | SportsNewser 'Mystic River' Screenwriter To Pen Jackie Robinson Movie By Cam Martin on Jun. 3, 2011 - 10:52 AM Deadline.com is reporting that Brian Helgeland, the screenwriter behind “Mystic River” and “L.A. Confidential,” has signed up to write and direct a long-awaited biopic about about the man who broke the colo ...