Theodor Seuss Geisel, creator of Horton the Elephant, the Grinch, the Cat in the Hat, and a madcap menagerie of the best-loved children’s characters of all time, stands alone as the preeminent figure of children’s literature. But Geisel was a private man who was happier at the drawing table than he was across from any reporter or would-be biographer. Under the thoughtful scrutiny of Charles D. Cohen, Geisel’s lesser known works yield valuable insights into the imaginative and creative processes of one of the 20th century’s most original thinkers.