René Adolphe Schwaller de Lubicz (December 30, 1887 – December 7, 1961), born René Adolphe Schwaller in Alsace-Lorraine, was a French Egyptologist and mystic who popularized the idea of sacred geometry in ancient Egypt during his study of the art and architecture of the Temple of Luxor in Egypt, and his subsequent book The Temple In Man.
Richard Harris Leigh (16 August 1943 – 21 November 2007) was a novelist and short story writer born in New Jersey, United States to a British father and an American mother, who spent most of his life in the UK. Leigh earned a BA from Tufts University, a master's degree from the University of Chicago, and a PhD from the State University of New York at Stony Brook.
Brad Steiger (February 19, 1936 – May 6, 2018) was an American writer of fiction and non-fiction works on the paranormal, spirituality, UFOs, true crime and biographies. His books sold well to the public but were widely criticized by academics and skeptics for making far-fetched claims without scientific evidence.