L. Frank Baum
Lyman Frank Baum was an American author, actor, and independent filmmaker best known as the creator of one of the most popular books in American children's literature, The Wonderful Wizard of Oz. He wrote thirteen sequels, nine other fantasy novels, and a host of other works (55 novels in total, 82 short stories, over 200 poems, an unknown number of scripts, and many miscellaneous writings), and made numerous attempts to bring his works to the stage and screen.
Author's Comment: Imagination has given us the steam engine, the telephone, the talking-machine, and the automobile, for these things had to be dreamed of before they became realities. [Source]