From Muppet Wiki

Lyndon Mosse has served as art director on several Muppet productions. His credits include work on several projects in the Muppet Photo Studio, including Muppet Magazine layouts and Miss Piggy's Guide to Life. In television, he worked in the Muppet Workshop on Fraggle Rock, served as production designer for Dog City, and has received several Emmy Awards for his work as an art director on Sesame Street. Most recently, Mosse served as art director for the new Sesame Beginnings video series.