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Theodor Seuss Geisel ( ( listen); March 2, 1904 - September 24, 1991) was an American author, political cartoonist, poet, animator, book publisher, and artist, best known for authoring more than 60 children's books under the pen name Doctor Seuss (abbreviated Dr. Seuss) (). His work includes several of the most popular children's books of all time, selling over 600 million copies and being translated into more than 20 languages by the time of his death. Geisel adopted the name "Dr. Seuss" as an undergraduate at Dartmouth College and a graduate student at the University of Oxford. He left Oxford in 1927 to begin his career as an illustrator and cartoonist for Vanity Fair, Life, and various other publications.

Geisel was born and raised in Springfield, Massachusetts, the son of Henrietta (nee Seuss) and Theodor Robert Geisel.  His father managed the family brewery and was later appointed to supervise Springfield's public park system by Mayor John A. Denison after the brewery closed because of Prohibition. Mulberry Street in Springfield, made famous in Dr. Seuss' first children's book And to Think That I Saw It on Mulberry Street, is less than a mile southwest of his boyhood home on Fairfield Street. Geisel was raised a Lutheran. He enrolled at Springfield Central High School in 1917 and graduated in 1921. He took an art class as a freshman and later became manager of the school soccer team.  Geisel attended Dartmouth College, graduating in 1925. At Dartmouth, he joined the Sigma Phi Epsilon fraternity and the humor magazine Dartmouth Jack-O-Lantern, eventually rising to the rank of editor-in-chief. While at Dartmouth, he was caught drinking gin with nine friends in his room. At the time, the possession and consumption of alcohol was illegal under Prohibition laws, which remained in place between 1920 and 1933. As a result of this infraction, Dean Craven Laycock insisted that Geisel resign from all extracurricular activities, including the college humor magazine. To continue work on the Jack-O-Lantern without the administration's knowledge, Geisel began signing his work with the pen name "Seuss". He was encouraged in his writing by professor of rhetoric W. Benfield Pressey, whom he described as his "big inspiration for writing" at Dartmouth.  Upon graduating from Dartmouth, he entered Lincoln College, Oxford, intending to earn a PhD in English literature. At Oxford, he met Helen Palmer, who encouraged him to give up becoming an English teacher in favor of pursuing drawing as a career.

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Dr. Seuss