Martin P. Robinson is an American puppeteer who works for the Jim Henson Company. He built, designed, and performed the Audrey II puppets for Little Shop of Horrors. He is best known for his work on Sesame Street, having performed the characters of Telly Monster, Mrs. Grouch (Oscar the Grouch's mother), Oscar's pet worm Slimey, Mr. Snuffleupagus, Oscar's niece Irvine, and Shelley the Turtle for 40 years. He also performed the characters Riff the Cat and Clef the dad on Allegra's Window, and was an animatronic puppeteer for Leonardo in Teenage Mutant Ninja Turtles. He is the puppeteer responsible for training the puppeteers on Sesame Tree. He also performed the Cat in the Hat in the second season of The Wubbulous World of Dr. Seuss.