Frank Oz
From Pixar Wiki
Frank Oz has had a long career as a performer and director. He has been a puppeteer with the Muppets since 1963, and in later years he branched out into directing such movies as the 1986 version of "Little Shop of Horrors" and "The Indian in the Cupboard". He is also well known for performing the voice of Yoda in the Star Wars series of films.
He performed the voice of Fungus in Monsters, Inc.
