Hanna-Barbera Cartoons, Inc., simply and commonly known as Hanna-Barbera, was an American animation studio and production company, which was active from 1957 until its absorption into Warner Bros. Animation in 2001. Founded on July 7, 1957 by Tom and Jerry creators and former MGM Cartoons employees William Hanna and Joseph Barbera along with George Sidney, it was headquartered in Los Angeles at the Kling Studios from 1957 to 1960, then on Cahuenga Boulevard from 1960 to 1998, and subsequently at the Sherman Oaks Galleria in Sherman Oaks from 1998 to 2001.