Richard Williams is famous in the animation community. His book on animation is considered the best available and a lot of people have seen his work on "Who Framed Roger Rabbit?", which was to direct the animation. Basically, he's incredible.
But something went wrong with his personal project, "The Thief and the Cobbler". This film goes back to Richard's earliest animations (which are breathtaking) and tells the story of his masterpiece and his life so far. It's a fascinating story.