Beginner Books is the Random House imprint for young children ages 3–9, co-founded by Phyllis Cerf with Ted Geisel, more often known as Dr. Seuss, and his wife Helen Palmer Geisel.
Their first book was Dr. Seuss's The Cat in the Hat (1957), whose title character appears in the brand's logo.
When others created the illustrations, he used either the pseudonym Theo LeSieg or Rosetta Stone.
Other authors of early Beginner Books were Robert M. Lopshire, Bennett Cerf, Al Perkins, Helen Palmer Geisel who wrote as Helen Palmer, Philip Dey Eastman, Stan and Jan Berenstain, Benjamin Elkin and Marion Holland.
Early Beginner Books employed many famous illustrators, including the aforementioned Theodor Seuss Geisel, P. D. Eastman, Stan and Jan Berenstain, and Robert Lopshire.