William Hanna met at least one person.
Hanna–Barbera . It was founded in 1957 by former Metro-Goldwyn-Mayer animation directors William Hanna and Joseph Barbera ( creators of Tom and Jerry ) and live-action director George Sidney in partnership with Screen Gems , a TV unit of Columbia Pictures . William Hanna . The two men began a collaboration that was at first best known for producing Tom and Jerry and live action/animated hybrid films . Hanna-Barbera 's shows had a worldwide audience of over 300 million people in their 1960s heyday , and have been translated into more than 28 languages .