His other notable characters include Rizzo the Rat, Bean Bunny, Beaker, Statler, Wembley Fraggle, and Sprocket the Dog.
Whitmire became interested in puppetry while watching the Sesame Street Muppets as a teenager. He began working as a puppeteer at an Atlanta theme park, which led to invaluable experience on local television. After meeting Caroll Spinney at a puppetry festival, he auditioned for Jim Henson and began his Muppet career in London working on The Muppet Show. Whitmire has been a principal Muppet performer since 1978 and has worked on every major Muppet project since.