Helen Marion Palmer Geisel (September 23, 1898 – October 23, 1967) was an American children's author, editor, and philanthropist. She was married to fellow author Theodor Seuss Geisel, better known as Dr. Seuss, from 1927 until her death. Her best-known books include Do You Know What I'm Going to Do Next Saturday?, I Was Kissed by a Seal at the Zoo, Why I Built the Boogle House, and A Fish Out of Water.