- Lyman Frank Baum (/bɔːm/; May 15, 1856 – May 6, 1919) was an American author best known for his children’s fantasy books, particularly The Wonderful Wizard of Oz, part of a series. In addition to the 14 Oz books, Baum penned 41 other novels (not including four lost, unpublished novels), 83 short stories, over 200 poems, and at least 42 scripts. He made numerous attempts to bring his works to the stage and screen; the 1939 adaptation of the first Oz book became a landmark of 20th-century cinema.