Dr. Seuss was, and remains two decades after his death, the world’s most popular writer of modern children’s books. He wrote and illustrated forty-four children’s books characterized by memorable rhymes, whimsical characters, and exuberant drawings that encouraged generations of children to love reading and expand their vocabularies. But, equally important, he used his pen to encourage youngsters to challenge bullies and injustice. Generations of progressive activists may not trace their political views to their early exposure to Dr. Seuss, but without doubt this shy, brilliant genius played a role in sensitizing them to abuses of power.