Mary Ann MacLean: The Process Church's Second Founder and the Woman Who Built Best Friends

The Woman the Process Did Not Name

For most of the Process Church’s public life, Mary Ann MacLean was photographed from the side, identified in captions as the co-founder, and quoted rarely. Robert de Grimston gave the interviews. De Grimston wrote the bulk of the theological texts, including the god-series essays that most readers first encounter. De Grimston’s face appeared on the back of the magazine. The 1970s journalism that reached the Process at all treated him as the figure and her as the consort, a reading that the group itself did little to correct during the years when both founders were running it together. When MacLean excommunicated her husband in 1974 and assumed sole leadership of the successor organizations, the correction became retroactive. The Process Church had always been her organization. Everything that happened after 1974, including the eventual reconstitution of the Kanab ranch as Best Friends Animal Society, was the second half of a project she had been quietly directing since the London flat.

The documentary record on MacLean is thinner than the record on de Grimston, and thinner than the conspiracy literature suggests. What the record supports is a woman who trained to a senior level in British Scientology before her thirtieth birthday, who exited with her husband in 1963 to start a private practice that would become a communal religious movement, who survived the 1966 Xtul hurricane, who ran the American expansion with particular attention to the New York chapter, who won the 1974 schism decisively enough that the organization’s public identity changed overnight, and who spent the thirty-one years between that schism and her death in 2005 executing an organizational pivot so gradual that most observers did not notice it had happened until Jesse Hyde wrote it up for Rolling Stone in 2014. The thinness of the record is partly her own work. She did not court press. She did not leave memoirs. The interior biography has to be reconstructed from the interiors that surrounded her.

Before Scientology

MacLean was born in 1931, grew up in Scotland, and worked through her early twenties in London in positions that are not consistently documented across the available sources. The Sugar Ray Robinson marriage claim belongs to this period. MacLean told the story to intimate colleagues and it entered the secondary literature through her own circulation. Robinson was in London in 1951 for the Turpin fight and returned through the mid-1950s on European tours that produced substantial press attention. No contemporaneous coverage names her. No entry in any of Robinson’s published biographies confirms the marriage. The claim sits at MHEES D2, one-step inference from a single source, and it is worth naming here because the conspiracy literature often omits the qualifier and the BFAS-critical literature often omits the claim. Both omissions distort.

Her Scientology period began in the late 1950s. She trained at Saint Hill Manor in East Grinstead, reached senior auditing rank within a small window, and by the time she met de Grimston was already positioned to leave. Bainbridge’s ethnography of the Process, published in 1978 under the pseudonym Sims with a pseudonym for the group itself, treats her Scientology training as the crucial precondition for the later organization: she had already been inside a total system, she had learned its therapeutic technique at a working level, and she was capable of rebuilding something similar outside it. Robert de Grimston, a former Sandhurst cadet who had drifted into Scientology from architecture school, followed her out.

Compulsions Analysis, Xtul, and the Theological Break

They married in 1963 and opened Compulsions Analysis in a flat in Wigmore Street. The practice combined Hubbard’s auditing with Adlerian goal analysis and was rebranded as a proprietary instrument. Roughly thirty paying clients became the founding cohort of what by 1966 was a residential commune. The group pooled assets, occupied Nassau briefly, and then settled on an abandoned salt works near the Yucatán fishing village of Xtul in the spring of 1966. Hurricane Inez destroyed the compound in September.

The Xtul disaster was the founding theological event. The survivors produced, in the subsequent year, a doctrine of returning gods and a four-part typology that became the quaternity. The quaternity was a genuine theological innovation. It was also, structurally, a portable therapy. The P-scale typed new members by god-pattern and assigned reading, which preserved the auditing-like one-on-one attention of Compulsions Analysis while scaling it across the American chapters. MacLean’s Scientology training was the substrate. De Grimston was the writer. The division of labor held for eight years.

The American Period and New York

The American chapters opened through 1967 and 1968. New Orleans first, then San Francisco’s Cole Street chapter during the Summer of Love, then New York on Cornelia Street and later the Lower East Side. MacLean ran the New York chapter in its most intense period. Wyllie’s memoir describes her as the administrative center of the organization by the late 1960s, handling the money, the property, and the internal discipline, while de Grimston handled the theology and the outside press.

The American period is also when the two contested external claims attach. The 1967 Haight overlap with Manson and the 1969 jailhouse interview will be treated at length in the forthcoming Manson connection spoke. The attribution of Son of Sam to Process remnants comes from Maury Terry’s 1987 book and will be treated in the forthcoming Son of Sam spoke. Neither claim involves MacLean directly. Both claims have been used to characterize the organization she was running.

The Organizational Arc

The 1974 Schism

By 1974 the theological trajectory had become intolerable to MacLean and to the Council of Masters. De Grimston had been pushing toward a position in which Christ absorbed the other three god-patterns, which collapsed the quaternity that the group had spent a decade elaborating. The doctrinal question was whether the reconciliation at the end of the age would preserve the distinctions among Jehovah, Lucifer, and Satan or dissolve them into Christ. The governance question was who would decide. MacLean and the Council called the question and removed de Grimston.

The excommunication was organizationally total. De Grimston left the Process with a small group of followers, attempted to continue a reduced operation under the original name, and failed to sustain it as a coherent body. He lived quietly in the United States until his death in 2022. MacLean kept the chapters, the magazine’s production infrastructure, the property, and the Council. The successor organization was renamed the Foundation Church of the Millennium within months, then the Foundation Faith of God, then the Foundation Faith of the Millennium, each rebrand further distancing the public identity from the Process period.

Kanab and the Long Pivot

The Kanab ranch was acquired in the late 1970s. The transition to animal work began almost immediately and ran through the 1980s. Members at every chapter house had always kept large dogs, and the New York chapter had organized informal rescue work as part of its street presence. At Kanab the dogs became the organizational center. The theology did not formally disappear. It receded into a background structure for members who had come up through the Process period, while the day-to-day work of the organization became indistinguishable from that of a conventional animal sanctuary.

The 1991 restructuring as Best Friends Animal Society was both an organizational event and a rhetorical one. The legal continuity is documented through successor-body filings and through the continuity of personnel, including MacLean herself, who remained in Kanab until her death. The rhetorical rupture was more substantial. Best Friends presented itself as founded in 1991 by a group of animal welfare advocates. The Process and Foundation Faith lineage was not part of the founding narrative and has not been added to it since.

The 2005 Death and the Rolling Stone Piece

MacLean died at Kanab in 2005. Best Friends did not publish an obituary narrating her role in the organization’s history. The lineage became a matter of record without becoming a matter of public acknowledgment, and the gap between the two positions remained stable until Jesse Hyde’s 2014 Rolling Stone piece, “The Best Friends Animal Society’s Shady Past,” which drew on interviews with former members and on the organization’s internal records to reconstruct the arc. Hyde’s piece did not claim that Best Friends’ present charitable work was compromised. It claimed that the history had been omitted, and the omission was itself a choice worth documenting.

What the Documented Record Supports

Two conclusions hold cleanly. MacLean was the structural leader of the Process Church from the 1974 schism through her death, and the organization’s trajectory across those thirty-one years was her project. Best Friends Animal Society’s organizational lineage runs through her, through the Foundation Faith organizations, through the Process Church, and through British Scientology’s Saint Hill Manor training of the early 1960s.

Two further claims require qualification. The Sugar Ray Robinson marriage is single-sourced and uncorroborated. The allegations of child abuse, animal sacrifice, and intelligence-community operation that circulate in conspiracy literature are not supported by any declassified document, any investigative file, or any named survivor with contemporaneous corroboration, and they should be named specifically rather than allowed to travel attached to her biography.

The honest summary is narrower and more interesting than either the conspiracy version or the hagiographic one. MacLean was a Scottish woman with Scientology training who built a small, disciplined, theologically coherent religious movement, lost control of the public face of it to her husband, took it back in a decisive 1974 coup, and then spent three decades quietly converting a London occult commune into the largest no-kill animal sanctuary in the United States. The transformation was real. The omission of her name from the organization that resulted is also real.

Further Reading

• Process Church pillar
• Robert de Grimston biography (forthcoming)
• Process Church and Best Friends Animal Society (forthcoming)
• Bainbridge, William Sims. Satan’s Power. University of California Press, 1978.
• Wyllie, Timothy. Love Sex Fear Death. Feral House, 2009.
• Hyde, Jesse. “The Best Friends Animal Society’s Shady Past.” Rolling Stone, October 2014.