Mary Ann MacLean

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Mary Ann MacLean (November 20, 1931 - November 14, 2005) was a co-founder of The Process Church of the Final Judgment.[1]

Early life[edit]

MacLean, who was born in Glasgow, Scotland,[1] grew up under poor conditions with a single mother who often left her daughter with relatives.[2]


In the early 1960s, MacLean moved to the United States where she lived an immersive life with the boxer Sugar Ray Robinson. After one year, she returned to the UK and London, working as call girl after getting involved in a prostitution-ring scandal, and then joining the Church of Scientology.[2] Among Scientologists, she met Robert Moor, later renamed by MacLean as Robert DeGrimston. They married in 1964, created their version of auditing (Scientology) called Compulsion Analysis. The next year they introduced the cult, The Process Church of The Final Judgment, to a small group of friends and like-minded people.[1] DeGrimston named himself "The Teacher" and MacLean "The Oracle" in the cult that slowly grew in the numbers. MacLean took care of the ideology as well as the strategy, while DeGrimston's face became the trademark of the business activity.[3]

In 1974, MacLean overpowered her husband by excluding him from his own church. Robert DeGrimston disappeared into the United States while Mary Ann MacLean tried to further develop a cult organisation, relocating the group to Arizona and renaming it The Foundation - Church of the Millennium. The church group relocated in 1984, with animals they had at their Arizona ranch, to property it purchased in Kanab, Utah.[4] Then, in 1991, The Process Church of The Final Judgment was dissolved and the church renamed Best Friends Animal Society, on the group's Kanab, Utah, property.[5] MacLean continued to engage, with a low profile, in spiritual and political life in Utah. In 2005, MacLean died, and the management of her charity was left to her second husband, Gabriel De Peyer,[6] a former Foundation Faith of God Church member and co-founder of Best Friends Animal Society.[7]


  1. ^ a b c "Love Sex Fear Death: The Inside Story of the Process Church of the Final Judgment". LA Weekly. July 22, 2009.
  2. ^ a b Giudice, Christian (2017). "Female Leaders in New Religious Movements: 'I, Jehovah': Mary Ann de Grimston and The Process Church of the Final Judgment, Ch. 7". Palgrave Macmillan – via
  3. ^ Clarke, Peter (March 1, 2004). "Encyclopedia of New Religious Movements". Routledge – via Google Books.
  4. ^ Glen, Samantha (2001). Best Friends: The True Story of the World's Most Beloved Animal Sanctuary. Kensington. ISBN 978-1-57566-735-5.
  5. ^ Kilzer, Lou. "Friends Find Their Calling". Rocky Mountain News – via Italic or bold markup not allowed in: |publisher= (help)
  6. ^ Introvigne, Massimo (September 29, 2016). "Satanism: A Social History". BRILL – via Google Books. Italic or bold markup not allowed in: |publisher= (help)
  7. ^ "Gabriel DePeyer". Best Friends Animal Society. July 23, 2015.