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human
> A native of Indiana, Sadler moved to Michigan as a teenager to work at the Battle Creek Sanitarium. There he met the physician and health-food promoter John Harvey Kellogg, co-inventor of corn flakes breakfast cereal, who became his mentor. Sadler married Kellogg's niece, Lena Celestia Kellogg, in 1897.
> John Harvey Kellogg (February 26, 1852 – December 14, 1943) was an American medical doctor, nutritionist, inventor, health activist, eugenicist, and businessman.
> Sadler also wrote about race:[39] he had an interest in eugenics, likely owing to Kellogg's interest in the concept,[40] and Madison Grant's book The Passing of the Great Race. Sadler wrote several works about eugenics, endorsing and heavily borrowing from Grant's views, which posited that the 'Nordic race' was superior to others.[41] In his writings, Sadler contended that some races were at a lower stage of evolution—closer to Neanderthals than were other races—and were consequently less civilized and more aggressive. Sadler argued that alcoholism[43] and 'feeblemindedness, insanity, and delinquency'[27] were hereditary traits and that those who possessed them were breeding at a much faster rate than 'superior human beings'.[27] He feared that this issue could threaten the 'civilization we bequeath our descendants'. He also believed that the majority of criminals were mentally ill.
>Kellogg dedicated the last 30 years of his life to promoting eugenics. He co-founded the Race Betterment Foundation,[7] co-organized several National Conferences on Race Betterment and attempted to create a 'eugenics registry'. Alongside discouraging 'racial mixing', Kellogg was in favor of sterilizing 'mentally defective persons', promoting a eugenics agenda while working on the Michigan Board of Health[8] and helping to enact authorization to sterilize those deemed 'mentally defective' into state laws during his tenure.
You can read more about the actual authors of the Urantia Book on Wikipedia. It’s all there.
gpt
>The authorship remains a matter of speculation. 
>It has received various degrees of interest ranging from praise to criticism for its religious and science content, its unusual length, and its lack of a known author.


>The Urantia Book is noted for its high level of internal consistency and an advanced writing style. Skeptic Martin Gardner, in a book otherwise highly critical of The Urantia Book, writes that it is 'highly imaginative' and that the 'cosmology outrivals in fantasy the cosmology of any science-fiction work known to me.'[71] Gooch says that for nonbelievers, the book is a mixture of being 'fascinating, inspiring, compelling, haunting, entertaining, annoying, incomprehensible, and always wordy.'[97]

>Parts I, II, and III are chiefly written in expository language. The papers are informational, matter-of-fact, and instructional. Part IV of the book is written as a biography of Jesus' life, and some feel it is a rich narrative with well-developed characters, high attention to detail, woven sub-plots, and realistic dialogue.

>Martin Gardner considers Part IV to be an especially 'well-written, impressive work,' and says, 'Either it is accurate in its history, coming directly from higher beings in position to know, or it is a work of fertile imagination by someone who knew the New Testament by heart and who was also steeped in knowledge of the times when Jesus lived.'[35]