The first Muppet Christie created was Butch, originally designed as a sabertooth tiger used in the "Toothbrush" skit of the Caveman Days series on Sesame Street. After years of learning Muppet design techniques, and building many of the classic Muppet characters, he was promoted to Muppet Supervisor in charge of Sesame Street (1991-1996). He was later promoted to Vice President/NY Muppet Workshop Supervisor (1997-2004) as well as Art Director for Henson on Sesame Street. He also contributed his skills to Henson Licensing and Publishing.