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Hanna-Barbera Cartoons, Inc. ( / ˈhænə bɑːrˈbɛərə / bar-BAIR-ə) [1] was an American animation studio and production company that was active from 1957 to 2001. It was founded on July 7, 1957, by William Hanna and Joseph Barbera following the decision of Metro-Goldwyn-Mayer to close its in-house cartoon studio. [2]