How many books did Dr. Seuss write?

Dr. Seuss wrote and illustrated 44 children's books. Among the books he's best known for are "Green Eggs and Ham," "The Cat in the Hat," "The Lorax," "One Fish Two Fish Red Fish Blue Fish," "Horton Hatches the Egg," "Horton Hears a Who!" and "How the Grinch Stole Christmas!"

Dr. Seuss was merely a pseudonym used by Theodor Seuss Geisel. While in college, he used the pen name Dr. Theophrastus Seuss, and would later use the pen names Theo LeSieg and Rosetta Stone. Geisel was born March 2, 1904, in Springfield, Mass., and he died September 24, 1991, in La Jolla, Calif. The library at the University of California, San Diego, is named after him.