Program on Psychedelics, Spirituality, and Religion (2021-2026)

psychedelic substances

The CSWR's long-running engagement with psychedelics and spirituality began with the widely popular "Psychedelics and the Future of Religion" series and expanded to include reading groups, workshops, public scholarship, art exhibitions, digital initiatives, and annual conferences. Between 2024 and 2026, the program, led by Jeffrey Breau and Paul Gillis-Smith, matured into a comprehensive, multi-pronged initiative within the broader Harvard Study of Psychedelics in Society and Culture, advancing research on psychedelic chaplaincy, fostering interdisciplinary research communities, and expanding public discourse around psychedelics and religion. 

The program had three primary goals: (1) to advance research on psychedelic chaplaincy; (2) to increase public awareness of pressing topics in the study of psychedelics and religion; and (3) to convene a scholarly community around the psychedelic humanities. In service of these goals, the program and affiliates developed a psychedelic chaplaincy training program, supported five multi-year research initiatives, produced over 22 publications, hosted two dozen public events, and organized four, interdisciplinary Psychedelic Intersections conferences.  

A review of the program's accomplishments and primary initiatives can be found below. 

People

Jeffrey Breau — Program Lead, Psychedelics and Spirituality (2024–2026); Student Assistant (2023–2024)

Paul Gillis-Smith — Program Lead, Psychedelics and Spirituality (2024–2026); Student Assistant (2023–2024)

Paola Andrea Sánchez-Castañeda — Postdoctoral Fellow, Religion and Indigenous Plant Medicine Traditions of the Americas (2024–2025)

Osiris González Romero — Postdoctoral Fellow, Psychedelics and Spirituality (2024–2025)

J. Christian Greer — Postdoctoral Fellow, Transcendence and Transformation (2020–2022)

Frédérique Apffel-Marglin — Research Affiliate, CSWR (2024–2026)

Christine Hauskeller — Visiting Scholar, Psychedelics and Spirituality (Fall 2024)

Erik Davis — Visiting Scholar, Psychedelics and Spirituality (Fall 2025)

Donna Torres — Visiting Scholar, CSWR (Fall 2025)

Stuart Ray Sarbacker — Visiting Scholar, Psychedelics and Spirituality (Spring 2026)

Sadie Trichler — Student Assistant, Psychedelics and Spirituality (2024–2026)

Lila Glenn Rimalovski — Student Assistant and Co-leader, Psychedelics Beyond Psychedelics Reading Group (2025–2026)

Paula Ortiz — Student Assistant and Co-leader, Psychedelics Beyond Psychedelics Reading Group (2025–2026)

Emily Marie Lippold Cheney — Student Assistant and Co-leader, Psychedelics Beyond Psychedelics Reading Group (2025–2026)

Tristan Angieri — Student Assistant and Leader, Psychedelics & Aesthetics Reading Group (2024–2025)

Roman Palitsky — External Collaborator, “Tending the Spiritual” Psychedelic Chaplaincy Project (2025–2026)

Caroline Peacock — External Collaborator, “Tending the Spiritual” Psychedelic Chaplaincy Program (2025–2026)

Psychedelic Chaplaincy

Tending the Spiritual in Psychedelic Care Workshops

The Tending the Spiritual workshops provided attendees with a broad overview of approaches to spiritually responsive care tailored to psychedelic settings. This program was featured in the Harvard Gazette, which provides more information about the pilot workshops and vision of the program. 

Our September workshop focused on spiritual care training for psychiatrists, MDs, chaplains, and researchers working in clinical psychedelic settings. The December workshop focused spiritual care training for church leaders, harm reduction specialists, lawyers, and caregivers working in community psychedelic settings. More information about September is available here and additional information about December can be found here.

Landscape Analysis: Spiritual Care and Psychedelic Facilitation

In the summer of 2025, the CSWR released “Psychedelic-Assisted Therapy Training in the US: A Landscape Analysis” preprint, which was published by the journal PLOS One in May 2026.

Commissioned by the CSWR and conducted by leading experts Roman Palitsky, MDiv, PhD (Emory Spiritual Health, Woodruff Health Sciences Center and Department of Psychiatry and Behavioral Sciences, Emory University School of Medicine) and Caroline Peacock, LCSW, DMin (Emory Spiritual Health and Winship Cancer Center Institute), the report’s findings are based on 13 established and emerging psychedelic facilitation training programs and presents the first detailed systematic analysis of both growing strengths and notable gaps in spiritual, existential, religious, and theological (SERT) care training.

View the PLOS One article here.

 

Workshop Analysis: Tending the Spiritual Workshops

In May 2026, the CSWR released “Tending the Spiritual Workshops: Development, Evaluation, and Autoethnographic Assessment of Lessons learned,” a report outlining the structure and pedagogy of the Center's Tending the Spiritual workshops, as well as lessons learned from these efforts.

Commissioned by the CSWR and conducted by leading experts Roman Palitsky, MDiv, PhD (Emory Spiritual Health, Woodruff Health Sciences Center and Department of Psychiatry and Behavioral Sciences, Emory University School of Medicine) and Caroline Peacock, LCSW, DMin (Emory Spiritual Health and Winship Cancer Center Institute), the report’s findings are based on an auto-ethnographic assessment conducted by the four workshop leads (Roman Palitsky, Caroline Peacock, Jeffrey Breau, and Paul Gillis-Smith).

View the preprint here. 

 

Psychedelic Intersections Conference

Psychedelic Intersections was the CSWR’s flagship conference on the study of psychedelics and spirituality. The conference was founded by Jeffrey Breau and Paul Gillis-Smith in 2023 and grew into an annual conference hosted by the CSWR. 

Together, the four events convened over 100 interdisciplinary scholars, practitioners, and policymakers working at the intersection of psychedelics and the humanities. They featured keynote presentations from Rick Doblin, Leonard Pickard, Carl Hart, Luis Eduardo Luna, Marian Goodell, Elías García Méndez, Ramzi Fawaz, Benjamin Breen, and Noah Feldman. 

Recordings from each year are available below.

Research and Publications

The psychedelics program supported five multi-year research initiatives:

1) Indigenous Medicine and Psilocybin Mushroom Rituals in Mesoamerica (Osiris González Romero): This project analyzed Indigenous medicine, especially psilocybin—a classic psychedelic or serotonin agonist that preferentially activates the 5-HT2A receptor subtype—which can enhance symbolic behavior, promote collective rituals, and amplify synchronicity.

2) Sacred Plant Medicines of the Muysca of Suba (Paola Andrea Sánchez-Castañeda): This ethnographic project focused on the use of sacred plant medicines by the Muysca community of Suba, an urban Indigenous community in Bogotá, Colombia. 

3) Novel Psychedelic Spiritual Communities (Jeffrey Breau): This multisite ethnography investigated new religious movements that use psychedelics in the U.S. to examine how novel psychedelic churches form, navigate legal frameworks, address safety, and better understand how psychedelics are reshaping religion and religious freedom in North America.

4) Saint Children, Psilocybin, and Epistemic Rupture (Paul Gillis-Smith): This project followed María Sabina’s insistence that psilocybin-containing fungi have lost their force given their use by foreigners by drawing from the records of the Wassons as “patient zero,” implicated in Sabina’s fungal prognosis.

5) Psychedelic and Ketamine Chaplaincy (Jeffrey Breau, Paul Gillis-Smith, Tara Deonauth): This clinical research program developed the practice of ketamine integration chaplaincy and investigated new approaches to psychedelic chaplaincy. 

 

Publications from Psychedelics and Spirituality program affiliates: 

Refereed articles

Jeffrey Breau & Paul Gillis-Smith, "Psychometric brahman, psychedelic science: Walter Stace, transnational Vedanta, and the Mystical Experience Questionnaire," Interdisciplinary Science Reviews, 48(5) (2023)

Christine Hauskeller et al., "Psychedelic therapies: healing for the wrong reasons?" Nature Mental Health 2 (2024).

Charles Stang, "Psychedelic Futures and Altered States in the Religions of the Ancient Mediterranean,"Harvard Theological Review 117, no. 4 (October 2024). 

Jeffrey Breau, Paul Gillis-Smith, & Tara Deonauth, "Ketamine Integration Chaplaincy: A Novel Spiritual Care Approach to Psychedelic Integration," Anthropology of Consciousness 36, no. 2 (2025).

Andrea Sanchez Castañeda, “There is No Territory to Sow”: Urban Coloniality of Nature and Muysca Dwelling," City & Society (March 2025).

Roman Palitsky, Caroline Peacock, Jeffrey A. Breau, Paul Gillis-Smith, & Gosia Sklodowska, "A landscape analysis of psychedelic facilitation training in the US," PLOS One (May 2026).

Edited volumes and chapters

ed. Jeffrey Breau and Paul Gillis-Smith, Psychedelic Intersections: 2024 Conference Anthology.

ed. Osiris Gonzalez Romero et al., Mesoamerican Narratives at the British Museum: Ancient Writing, Contemporary Voices (De Gruyter Brill, 2025)

Andrea Sanchez Castañeda, "Quyca chiahac chixisqua (Sowing ourselves in the territory): embodied experiences of Indigenous urban gardens and the coloniality of nature," in Decolonizing Bodies (Bloomsbury, 2025)

Osiris Gonzalez Romero, “Healing of the Thunderbolt and the Nahua Entheogenic Medicine," Handbook Of Entheogenic Medicine (Brill, 2025).

ed. Jeffrey Breau and Paul Gillis-Smith, Psychedelic Intersections: 2025 Conference Anthology.

Public scholarship

Osiris Gonzalez Romero "Ritual and Religious Uses of Psilocybe Mushrooms in Mesoamerica," CSWR Research Reflections, October 2024. 

Paul Gillis-Smith, "Lisa Bieberman and the Moral Challenge of LSD: Revising Harvard's History of of Psychedelics," CSWR Research Reflections, January 2025. 

Andrea Sanchez Castañeda, "Re-appropriation Through Ritual: Muysca Indigenous Resurgence and Performance," CSWR Research Reflections, February 2025. 

Jeffrey Breau, "Charting Novel Psychedelic Spiritual Communities," CSWR Research Reflections, March 2025. 

Andrea Sanchez Castañeda, "Muysca Cosmopolitics," CSWR Research Reflections, June 2025. 

Erik Davis, "Superstar: The Psychedelic Jesus of the Counterculture," CSWR Research Reflections, October 2025. 

Paul Gillis-Smith, "LSD Gospel, Christmas Tidings, and the FDA during the Psychedelic Sixties," Petrie-Flom Center Bill of Health, November 2025. 

Jeffrey Breau, "What a Psychedelic Church Reveals about Religion and the Law," Petrie-Flom Center Bill of Health, November 2025. 

Osiris Gonzalez Romero, "The Holy Inquisition and the Genesis of Seventeenth-Century Peyote Banning," CSWR Research Reflections, December 2025.

Jeffrey Breau, "What Makes Psychedelic Experiences Sacred?" CSWR Research Reflections, October 2025. 

Stuart Sarbacker, "Biohacking, Yoga, and Psychedelics," CSWR Research Reflections, March 2026. 

Paul Gillis-Smith, "How Psychedelic Science Invented a History of Religion," CSWR Research Reflections, May 2026. 

CSWR Digital Displays

Osiris Gonzalez Romero, Sacred Plants and Fungi of the Americas, 2025.

Andrea Sanchez Castañeda, Sacred Plants of the Muysca – In the Words and Photos of Community Members, 2025. 

 

Collaborating Centers

The Psychedelics and Spirituality program was fortunate to work with many collaborators at Harvard and beyond. 

In particular, we recognize and thank our collaborators in the Harvard Study of Psychedelics in Society and Culture, which includes the teams at The Petrie-Flom Center for Health Law Policy, Biotechnology, and Bioethics at Harvard Law School and the Mahindra Humanities Center. The CSWR also worked closely with colleagues from Harvard Divinity School's Office of Ministry Studies, co-sponsored the "Psychedelics in Monotheistic Traditions: Sacramental Practice and Legal Recognition" conference with the Julis-Rabinowitz Program on Jewish and Israeli Law at Harvard Law School, and collaborated with researchers from the Emory Center for Psychedelics and Spirituality on psychedelic chaplaincy initiatives.  

 

Reading Groups and Workshops

The CSWR hosted a variety of reading groups and workshops, examining psychedelics and research related to them through decolonial, archival, devotional, and aesthetic prisms, among others. Find the catalogue of these groups and their reading lists below. 

Psychedelics and the Future of Religion

In 2020, the Center launched its online speakers series Psychedelics and the Future of Religion. The series hosted dozens of events with leading scholars working at the intersection of psychedelics and religion. 

Select videos from the series are below. The entire series is accessible on the CSWR YouTube channel and the HDS YouTube channel.

 

Art Exhibits and Digital Displays

Program affiliates led digital displays and in-Center art exhibits that represented a visually compelling and accessible approach to scholarship.

Public Programming

How Psychedelic Science Invented a History of Religion

Edited by Aaron Michael Ullrey The following Research Reflection is part of an ongoing series spotlighting the academic study of religions. It is challenging for me to imagine a time before the concept of “the psychedelic” existed, despite its emergence...
Lab desk with magnifying glass, scrolls, plant specimens, and tinctures

What Makes Psychedelic Experiences Sacred?

Edited by Aaron Michael Ullrey. The following Research Reflection is part of an ongoing series spotlighting the academic study of religions. In my research on novel psychedelic spiritual communities (NPSCs) in North America, my interlocutors regularly...
Fading light in the sky, clouds, treeline and birds in the far distance.

Charting Novel Psychedelic Spiritual Communities

Novel psychedelic spiritual communities are often radically inclusive spiritual communities that do not require members to have the same beliefs. They set forth pluralistic, non-binding doctrines, whose common belief is the possibility that psychedelics...

Large gathering againt bright light