 He was involved in the production of "Wizard of Oz" (1925), and "The Wizard of Oz" (1933), for which he also received writing credit, after which he sold "The Wonderful Wizard of Oz" film rights to Samuel Goldwyn.His attempt to trademark the Oz name distanced him from the rest of his family.In addition, "To Please a Child" has been suspect since before it was published, as most of his family refused to confirm any details about his father's life, leading Baum to fabricate some details.