From Muppet Wiki

Jeff Conover is the master puppeteer for Disney Entertainment at Walt Disney World, in charge of casting and coordinating puppetry for the many live stage shows, including Playhouse Disney: Live on Stage. He also puppeteered on the Disney television series Sing Me a Story With Belle (as the voice and operator of Harmony the cat, and puppeteer of others).

He puppeteered for Henson/Sesame Workshop on Big Bag, filmed in Orlando, Florida, mostly assisting on Chelli. Conover was also one of four performers to operate Bad Andy for the Domino's Pizza commercials.