She trusted her immense intuition and generous heart--and published the most. Ursula Nordstrom, director of Harper's Department of Books for Boys and Girls from 1940 to 1973, was arguably the single most creative force for innovation in children's book publishing in the United States during the twentieth century. Considered an editor of maverick temperament and taste, her unorthodox vision helped create such classics as Goodnight Moon, Charlotte's Web, Where the Wild Things Are, Harold and the Purple Crayon, and The Giving Tree.

Leonard S. Marcus has culled an exceptional...