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William Hanna co-founded Hanna-Barbera, an American animation studio that is best known for producing animated cartoons for television, including The Flintstones, Scooby-Doo, Yogi Bear, and The Jetsons. The studio was founded in 1957 by Hanna and Joseph Barbera, who had previously worked together at Metro-Goldwyn-Mayer. Hanna-Barbera is one of the most successful animation studios in history, and its cartoons have been enjoyed by children and adults alike for decades.