He designed the Pacific Northwest Ballet's "Nutcracker" production that later became a movie shown on television, and he served as producer of various animated TV series based on his illustrations, including "Seven Little Monsters," ''George and Martha" and "Little Bear."
But despite his varied resume, Sendak accepted — and embraced — the label "kiddie-book author."
"I write books as an old man, but in this country you have to be categorized, and I guess a little boy swimming in the nude in a bowl of milk (as in 'In the Night Kitchen') can't be called an adult book," he told The Associated Press in 2003.
"So I write books that seem more suitable for children, and that's OK with me. They are a better audience and tougher critics. Kids tell you what they think, not what they think they should think."
During that 2003 interview, Sendak also said he felt as if he were part of a dying breed of illustrators who approached their work as craftsmen. "I feel like a dinosaur. There are a few of us left. (We) worked so hard in the '50s and '60s but some have died and computers pushed others out."