Maurice Sendak, the author of the beloved children’s book Where the Wild Things Are, died on Tuesday from complications of a recent stroke. He was 83. Sendak was considered one of the greatest children’s book artists of the 20th century, as he famously upended the traditional theory of children’s literature of teaching moral lessons through well-behaved heroes and heroines. His genre-breaking books included In the Night Kitchen, Outside Over There, Chicken Soup With Rice, and the recently published Bumble-Ardy. A posthumous picture book, My Brother’s Book, a poem written and illustrated by Sendak and inspired by his late brother, is scheduled to be published next February.