Theodor Seuss Geisel (pronounced /ˈɡaɪzəl/; March 2, 1904 – September 24, 1991) was an American writer and cartoonist who was most widely known for his children's books written under his pen name, Dr. Seuss. He published over 60 children's books, which were often characterized by imaginative characters, rhyme, and frequent use of trisyllabic meter. His most celebrated books include the bestselling Green Eggs and Ham, The Cat in the Hat, and One Fish Two Fish Red Fish Blue Fish. Numerous adaptations of his work have been created, including eleven television specials, three feature films, and a Broadway musical.

Theodor Seuss Geisel has also written books that help to give a life lesson to older children, as well as entertain them with intriguing tales and unique characters. One of these books is "The Lorax". The Lorax contains the quote "Unless someone like you cares a whole awful lot, nothing is going to get better, it's not." The storyline tells of the Lorax's world being turned upside down when a strange creature comes and sets up an enormous factory, killing the Lorax's habitat. Another one of these stories-with-a-moral is "The Butter Battle Book". The Butter Battle Book is about two cities that are very different, and like to settle their disputes in a cold war of threating machines that grow in technology and creativity. He teaches readers of the uslessness of fighting over insignificant differences. Truly, Dr. Seuss has been a teacher to children all over the world.

Geisel also worked as an illustrator for advertising campaigns, most notably for Flit and Standard Oil, and as a political cartoonist for PM, a New York City newspaper. During World War II, he worked in an animation department of the U.S Army, where he wrote Design for Death, a film that later won the 1947 Academy Award for Documentary Feature.