The next Muppet/Sesame Street performer is Martin P. Robinson.
Martin P. Robinson began working with The Jim Henson Company in 1980. Although he assisted on many Muppet performances, he's best known for his contribution to Sesame Street.
He's been performing the character of Snuffleupagus (the front half and voice, that is) and Telly Monster as well as other characters since he started at Sesame Street in 1981. He still plays a vital role in the cast to this day.