Even If you think you don't know Jim Henson, you've certainly seen his work. Henson was the mind behind the hugely successful Sesame Street and subsequent Muppet spin off's including a TV show and dozens of movies between 1969 and 2014. He also lent his voice to the most recognisable of all Henson's creations - Kermit the Frog. You can understand then, the reason that George Lucas approached Henson to take on the voice of Yoda for his second Star Wars instalment. The man had, at this point, over a decade and a half experience in the 'puppets on TV' business and would have lent not only his voice but a wealth of knowledge and ideas on how to present the character whilst shooting. It's unknown as to why Henson ultimately turned down Lucas' (a well-regarded friend of his) offer but he did end up recommending Frank Oz (who Henson worked with on The Muppet Show). Lucas clearly valued his friend's opinion as Oz was cast in the role - a role he would go on to reprise five more times and build a career around.