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American animators William Hanna and Joseph Barbera both began working at Metro-Goldwyn-Mayer (MGM) in 1937. The two soon created the cartoon characters Tom, a cat, and Jerry, a mouse, and from 1940 to 1957, they produced more than 200 cartoons, seven of which won Academy Awards. In 1957, they left MGM and set up their own production company, Hanna-Barbera, concentrating on cartoon series produced specifically for television, including The Flintstones, Yogi Bear, and what others? Discuss
Source: The Free Dictionary