Founders: Hanna-Barbera Productions

We often associate Hanna-Barbera with such hits as The Flintstones, The Jetsons, Scooby-Doo and Yogi Bear, and these are certainly the most successful cartoons to emerge from the company. And yet these mega-hits only comprise a small sample of the body of work the company produced.

To date, fifty-five properties carry the Hanna-Barbera name, spanning a period from the creation of Tom & Jerry in 1940 to the launch of the Cartoon Network with shows like Powerpuff Girls and Johnny Bravo. Though Hanna and Barbera served only in an advisory role on most of the productions after the mid-'60s, they continued their involvement in the company's output until their deaths.

The influence of Hanna-Barbera is felt throughout TV animation today, from children's shows to Adult Swim; many of these shows still use Hanna-Barbara's vast library of sound effects.