Jim Henson began to learn the art of puppetry in high school. He performed and voiced many Muppets, including Ernie from "Sesame Street" and Kermit the Frog. Henson was involved in everything to do with the Muppets, including design, building, writing, directing, producing and performing. After he died in 1990, Muppeteer Steve Whitmire took over many of the Muppets that Henson had performed.
According to Henson, Frank Oz was the person most responsible for the Muppets' humor. He was originally hired at the age of 19 to replace Jane Henson, Jim's wife, when they started a family. Some of the Muppets Oz has performed and voiced include Grover, Bert, Cookie Monster, Fozzie Bear and Miss Piggy. He also played Yoda in "Star Wars." Oz wrote and directed some of Henson's productions, and though he now directs mostly for other companies, he still occasionally performs and voices some of the Muppet characters.
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