(Information from the article "The Master of Mandingo" by Rudy Maxa, which appeared in The Washington Post, July 13, 1975.)
The son of a midwestern general store owner, he moved to California with his widowed mother in the early 1900s and was a local breeder and judge in regional dog shows. He was an eccentric who was happy with a life of little work, ample cigarettes, and gin.
After collaborating with his adopted son on a book on dog breeding, he decided to write a book that would make him rich. Utilizing his son's anthropology research on West Africa, he handwrote Mandingo and his son served as editor. Denlinger's, a small Virginia publisher, released it and it became a national sensation, consumed by the public and derided by the critics.
After its paperback release by Fawcett, Onstott began his collaboration with Lance Horner, a Boston eccentric with a knack for recreating Onstott's style. The two men never met, but they collaborated on several books before Onstott's death, after which Horner continued the Falconhurst saga and penned other pulpy novels set in other eras. When Horner died in 1970, Fawcett signed prolific author Harry Whittington to continue writing Falconhurst tales under the name of Ashley Carter.
Although the Falconhurst series has sold near or over 15 million copies, it (and its authors) remain in the shadows of bestselling popular literature.