Theodor Seuss Geisel, better known by his pen name Dr. Seuss, was a writer and cartoonist who published over 60 books. He published his first children's book, And To Think That I Saw It on Mulberry Street, under the name of Dr. Seuss in 1937.

Dr. Seuss was born on March 2, 1904, in Springfield, Massachusetts to Theodore Robert Geisel and Henrietta Seuss Geisel. At age the age of 18, Dr. Seuss was accepted into Dartmouth College and left home to attend the university. During his time at Dartmouth, Geisel became the editor-in-chief of the humor magazine Jack-O-Lantern, but when he and his friends got caught drinking in the dorm room, a violation of the prohibition laws, he was removed from the editorial staff. However, he continued to contribute to the magazine under the pseudonym Dr. Seuss.

After his time at Dartmouth, he attended graduate school at Oxford University, but eventually dropped out. While studying at Oxford, Geisel met his future wife, Helen Palmer. The couple married in 1927 and moved back to the United States the same year. In October 1967, Palmer, who was suffering from both cancer and the emotional pain caused by an affair Geisel had with their longtime friend Audrey Stone Dimond, committed suicide. Geisel married Dimond, a film producer, the following year. Dimond is known for her work on the films The Lorax (2012), Horton Hears a Who! (2008), and Daisy-Head Mayzie (1995). Geisel never had any children of his own.

Upon returning to America after his attempt at Oxford, Seuss decided to pursue cartooning full-time. His articles and illustrations were published in numerous magazines, including LIFE and Vanity Fair. A cartoon that he published in the July 1927 issue of The Saturday Evening Post, his first using the pen name "Seuss," landed him a staff position at the New York weekly Judge. Geisel next worked for Standard Oil in the advertising department, where he spent the next 15 years. His ad for Flit, a popular insecticide, became nationally famous. Around this time, Viking Press offered Geisel a contract to illustrate a children's collection called Boners. The book sold poorly, but it gave him the break he needed to become involved in the world of children's literature.

During WWII, Seuss who was too old to be drafted became a part of Frank Capra’s Signal Corps, where he made animated training films and drew propaganda posters for the Treasury and War Bond departments.

After the war, Seuss purchased an abandoned observatory in California where he wrote for 8 hours a day, dreaming up ideas for books to be crafted by his pen. Some of Seuss’s most popular books include; The Cat in the Hat (1957), Horton Hears a Who! (1954), How the Grinch Stole Christmas (1957), Green Eggs and Ham (1960), One Fish Two Fish Red Fish Blue Fish (1960), The Lorax (1971), and Oh the Places You’ll Go (1990). Geisel died on September 24, 1991, at the age of 87, in La Jolla, California. In 1997, the Art of Dr. Seuss collection was launched. Today, limited-edition prints and sculptures of Geisel's artworks can be found at galleries alongside the works of Rembrandt, Pablo Picasso, and Joan Miró. Sixteen of his books are on Publishers Weekly's list of the "100 Top-Selling Hardcover Children's Books of All-Time."