Ray Lee was supervising director on the animated Fraggle Rock and (with others) for Muppet Babies and Little Muppet Monsters.
While most animation directors begin as animators, Ray Lee had originally been a camera operator. He started with Filmation in the late sixties on their Archie cartoons, The Batman/Superman Hour, and others. A ten year stint with DePatie-Freleng followed, working on the Pink Panther shorts, Dr. Seuss specials, and The Fantastic Four among others. He moved to Hanna-Barbera (Super Friends, The Smurfs, The Jetsons, The 13 Ghosts of Scooby-Doo, etc.) but then went to Marvel Productions (which came about after DePatie-Freleng sold to Marvel).
At Marvel Productions, Lee was a supervising director on most of their projects, including My Little Pony: The Movie, G.I. Joe, Jem, Defenders of the Earth, Transformers, and more.