McSweeney's founder Dave Eggers, whose 2009 novel "The Wild Things," was inspired by Sendak's famed "Where the Wild Things Are," tweeted: "We'll be roaring our terrible roars today. RIP, Maurice Sendak."

AP Photo, file
Author Maurice Sendak poses with one of the characters from his book "Where the Wild Things Are," designed for the operatic adaptation of his book in St. Paul, Minn., in this September 1985 file photo.