William Wallace Denslow (5 May 1856 – 27 May 1915) is known as W. W. Denslow. He was an American illustrator and caricaturist. He was born in Philadelphia. He had some art school training, but he was mostly self-taught. He designed books and posters. Denslow illustrated L. Frank Baum's "The Wonderful Wizard of Oz" and other books by Baum. They parted after an argument over copyright royalties.