Dr. William S. Sadler professed that a group of celestial beings began to communicate to him through a sleeping man in Chicago from 1911 until 1923. He and his wife, Lena Sadler, both well-known and highly respected local physicians, claimed there were "probably 250 night sessions," during which these celestials spoke through their patient. The identity of the patient was never revealed. From 1924-1934, the Sadlers held a Forum in their home to study the voluminous notes and to compose questions for the celestial beings about human origins and destiny. The result was The Urantia Book, which claims to be the fifth epochal revelation to humankind. Published in 1955, it has sold over 750,000 copies by word of mouth. Although translated into 17 languages, relatively few people know about it or the amazing story of its creation. The History Of The Urantia Book explores the professional lives and spiritual pursuits of the Sadlers and the extraordinary role that Dr. Sadler played in bringing this 2,097-page tome to the world. It compares the "origin story" with the scholarly discovery of relevant facts and circumstances that led to its publication. It also sheds new light on the fiercely protected identity of the "patient" and likely scribe for these revelations.