Theodor Seuss Geisel, a.k.a. DoctorSeuss, is best known for his children's books, of which he wrote more than 40. Many (his best-known) he also illustrated himself; his artwork has a rather unique and humorous style. Some of his best known are:
There's also a wonderful parody of his style, easiest found with
And let's not overlook the Dr. Seuss Bible: See http://www.seuss.org/ for additional information.Any (adult) interested in Dr Seuss should take a look at his other art in "TheSecretArtOfDrSeuss".
In addition to DoctorSeuss, Geisel also used the pen name "Theo. LeSieg?" (Giesel spelled backwards) when he was the author but not the illustrator of a book.