20th Century Fox studio executive Gavin Smith has been missing since May 1 when he was last seen leaving a friend's residence in Oak Park between 9 and 10 p.m.
Smith's family is offering a $20,000 reward for information leading to his whereabouts.
Smith is described as a 57-year-old white man standing 6 feet 6 inches tall, with graying blond hair and green eyes. Police believe he is driving a black 2000 Mercedes-Benz 420E with tinted windows and a roof rack, with California license plate number 6EKT044.
Anyone with more information on his location was asked to call detectives at (323) 890-5500, or Crime Stoppers at (800) 222-TIPS.
City News Service contributed to this report.