Lyman Frank Baum was an American author chiefly famous for his children's books, particularly The Wonderful Wizard of Oz and its sequels. He wrote 14 novels in the Oz series, plus 41 other novels, 83 short stories, over 200 poems, and at least 42 scripts. He made numerous attempts to bring his works to the stage and the nascent medium of film; the 1939 adaptation of the first Oz book would become a landmark of 20th-century cinema.
Baum worked primarily with John R. Neill on his fantasy work beginning in 1904, but Baum met Neill few times (all before he moved to California) and often found Neill's art not humorous enough for his liking. He was particularly offended when Neill published The Oz Toy Book: Cut-outs for the Kiddies without authorization.
(source: wikipedia)