P.D. Eastman

Philip Dey Eastman (1909–1986) was an American screenwriter, children's author, and illustrator, and the books carry the name P.D. Eastman. Titles include Are You My Mother? and Go, Dog. Go!, along with Big Dog... Little Dog: A Bedtime Story, in which two dogs of very different sizes learn to be friends. Eastman wrote for children and illustrated the books too.