This encyclopedia is about the American animation studio Hanna-Barbera, founded by producers and directors, William Hanna and Joseph Barbera in 1957. It also features their work spun off into different studios and parent companies, and Ruby-Spears' work while the studio was owned by Taft Broadcasting/American Broadcasting Company, which also owned Hanna-Barbera. In 1991, the intellectual properties of Hanna-Barbera and Ruby-Spears were purchased by Turner Broadcasting System, which in turn, was merged with TimeWarner (now WarnerMedia Warner Bros. Discovery) in 1996, and remain with the company today.
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