From Muppet Wiki

Martin P. Robinson (b. March 9, 1954) is a puppeteer who has performed on Sesame Street since 1980. His characters include Telly Monster, Mr. Snuffleupagus and Slimey.

Official bio

from sesameworkshop.org:

Martin Robinson has been on staff at The Jim Henson Company since 1980. Originally hired to play Aloysius Snuffleupagus, he also lends his talents to Telly Monster, Slimey the Worm and many other characters. He has played an active role in hiring and training puppeteers for local Sesame Street productions in Mexico, Israel, Palestine, Egypt, Russia, and Bangladesh. Robinson's stage credits include designing, building and performing Audrey II in the Broadway production of Little Shop of Horrors, and set designing and building for the Broadway production of Frogs. He played the Cat in the Hat on the television show The Wubbulous World of Dr. Seuss, and performed the animatronics for Leonardo in the movie Teenage Mutant Ninja Turtles. Recent projects include Allegra's Window on Nickelodeon, for which he coordinated the construction of the puppets and playsed several characters. Robinson got into the business as a member of the Bil Baird Puppet Company.

Henson Puppeteer Credits

• Sesame Street: Book, Buster the Horse, Monty, Mr. Snuffleupagus (1981-), Slimey, Shelley the Turtle, Telly Monster, Vincent Twice, Yip Yip Martians
• The Muppets Take Manhattan: Rat, The Swedish Chef (hands), Muppet Babies
• Little Muppet Monsters
• The Tale of the Bunny Picnic: The Farmer
• Teenage Mutant Ninja Turtles: Leonardo (face)
• The Muppets Celebrate Jim Henson
• A New Baby in My House: King Goodheart
• Dog City - Scratch McCollie, others
• The Wubbulous World of Dr. Seuss: The Cat in the Hat (Season 2), Civil Servants #1, #2, #5, and #6, The Milk, The Old Man,

Non-Henson Credits

Marty Robinson at a puppeteering workshop. Marty is a puppeteer scout for co-productions of Sesame Street.

• Little Shop of Horrors: Performed Audrey II for both the Broadway and Off-Broadway productions
• Spitting Image

Puppet Design Credits

• Designed puppets for the Broadway production of The Frogs

Trivia

Robinson was born in Michigan and grew up in Brookfield, Wisconsin where he attended Brookfield East High school. A talented actor and musician, he played the lead in several musicals, including Bernardo in West Side Story and Fagin in Oliver.