|Born||23 July 1900
|Died||20 June 1967 (66) 
|Affiliations||Cosmic Circle of Fellowship|
William R. Ferguson (July 23, 1900 - June 20, 1967) was an American promoter of relaxation therapies and contactee.
- "Relax First", teaching on the art of relaxation, from the mid-1930s.
- Invented and began manufacture of Zerret Applicator, a plastic dumbbell containing special water that would allegedly generate healing "z-rays", c. 1940s.
- After first being brought to trial in the late 1940s, Ferguson was sentenced to two years in jail for misbranding of Zerret Applicator in 1950.
- Founded "Cosmic Circle of Fellowship" in 1954. Shortly after, Ferguson first published "My Trip to Mars", in which he made claims that he achieved illumination and transcended our dimension in 1938, came into contact with Khauga of Mars in 1947.
- Run-in with the law stemming from his sales pitch on a Martian "brain-relaxing helmet" to a Milwaukee policewoman, 1954.
- Ferguson, William (1937), Relax First, Chicago, Ill.: Bronson-Canode Printing Co.
- Ferguson, William (1954), Illumination of My Consciousness, Washington, D.C.: Miracle Hour
- Ferguson, William (1954), My Trip to Mars, Chicago: Cosmic Circle of Fellowship
- Khauga the Comforter; Ferguson, William (1955), A Message from Outer Space: A Decoding of the Book of Revelation (the Apocalypse) of the Bible; This Book Was a Revelation of Jesus Christ Given to His Angel to Give It to John His Servant Who Was on the Isle of Patmos When the Revelation Was Given.
- Ferguson, William (1955), Five Hours with the Oligarchs of Venus, Chicago: Cosmic Circle of Fellowship
- Ferguson, William (1959), The New Revelation
- "Illinois, Cook County Deaths, 1878-1994," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:Q2MX-L3VP : 17 May 2016), William R Ferguson, 20 Jun 1967; citing Chicago, Cook, Illinois, United States, source reference , record number , Cook County Courthouse, Chicago; FHL microfilm.
- 3157. Misbranding of Ferguson's Zerret Applicator. U. S. v. William R. Ferguson (Ferguson's Zerret Applicator), Mary A. Stanakis. (nih.gov) — "Pleas of not guilty having been entered on behalf of the defendants, the case came on for trial before the court and jury on May 10, 1950. The trial was concluded on May 17, 1950, at which time the jury returned a verdict of guilty against each defendant. A motion for a new trial was filed on behalf of the defendants on May 18, 1950, and was denied on May 22, 1950. On the latter date, the court imposed jail sentences of 2 years against William R. Ferguson and 1 year against Mary A. Stanakis."
- "Miscellany: Wild Blue Yonder", TIME, 29 Nov. 1955, http://content.time.com/time/magazine/article/0,9171,857765,00.html, "In Milwaukee, police looked for William Ferguson, lecturer (at $1 a head) on the wonders of Mars, after he 1) tried to sell Policewoman Mary Smeaton a brain-relaxing helmet and other souvenirs he said he brought back from his trip to the planet in 1947; 2) told her she would return to her home planet Saturn after 14,000 more years; 3) rhapsodized about Martian food, which the body absorbs without the need for elimination, and Martian water, which can be swum in without getting wet."