He briefly attended Cornell University, studying law, and he would act as his parents' lawyer when they traveled abroad.

Soon after the venture ended, Baum re-enlisted in the army and fought in World War I, achieving the rank of lieutenant colonel.

After the death of L. Frank Baum, Ruth Plumly Thompson was selected to continue the Oz series by publishers Reilly & Lee.

The film depicts Dorothy Gale as an eighteen-year-old princess betrothed to Prince Kynd, whose throne is coveted by the Prime Minister and his Lady.

A Scarecrow, Tin Woodsman [ sic ], and Cowardly Lion all appear, but they are nothing more than men who have put on disguises to avoid capture.

After Maud died in 1953, he was admitted back into The Baum Trust, but he had gained only the tolerance, and not the faith of his family.

When Justin G. Schiller founded the International Wizard of Oz Club, Baum was appointed its first president, and served in that position until his death.

He had been working in near-isolation on a biography of his father, eventually titled To Please a Child, derived from an inscription L. Frank Baum wrote in his sister Mary Louise's copy of The Wonderful Wizard of Oz, after a suggestion by Fred M. Meyer, the club secretary.

Reilly and Lee had imposed a 1961 deadline, and the book that appeared is filled with Frank Joslyn Baum's mythologizing about his father, claiming so far as that L. Frank Baum had had a heart attack at age 12 and had marched in a torchlight parade in support of William Jennings Bryan's presidential candidacy, both of which were fabrications.

The Dreamer of Oz: The L. Frank Baum Story credits Michael Patrick Hearn as a principal source.

While Hearn collaborated with David Brooks on the original treatment, the final script by Richard Matheson primarily relied upon To Please a Child.