James Allen St. John (October 1, 1872 in Chicago–May 23, 1957 in Chicago) was an American author, artist and illustrator. He is especially remembered for his illustrations for the novels of Edgar Rice Burroughs, although he illustrated works of many types. He taught at the Chicago Art Institute and with the American Academy of Art. He is considered by many to be 'The Godfather of Modern Fantasy Art'. His most famous disciples were Roy Krenkel and Frank Frazetta, the latter of whom has also been styled as the grandmaster of the Genre.
St. John's artistic career began in 1898. He studied at the Art Students League of New York which included William Merritt Chase, F.V. Du Mond, George de Forest Brush, H. Siddons Mowbray, Carol Beckwith and Kenyan Cox. This was followed by his first commercial relationship with the New York Herald. During this period he spent time in Paris from 1906-1908 at the Académie Julian, then moved to Chicago around 1912. Here he began his work with the publisher A.C. McClurg & Co., although he had already produced his best known work for this publisher back in 1905, The Face in the Pool, which he had both written and illustrated.
Source: Wikipedia, "J. Allen St. John", available under the CC-BY-SA License.