O'Hara, Dennis Patrick
Dennis Patrick O'Hara

PhD (St. Michael's)

dennis.ohara@utoronto.ca | 416-926-1300 ext 3408


Dr. Dennis Patrick O’Hara began his career as a chiropractor (1979) and naturopathic doctor (1986), both as a practitioner in private practice as well as an educator at the colleges of each of those professions. He has been a consultant and facilitator for the Natural Health Products Directorate of Health Canada where he facilitated six international consultations. He was a co-investigator in a 5-year research project funded by the Canadian Institutes of Health Research (CIHR) to establish the Canadian Interdisciplinary Network for Complementary and Alternative Medicine Research. He has drafted a description of the naturopathic profession for the World Health Organization and wrote the summative report for the 2006 World Health Organization International Consultation on Phytotherapy held in Milan, Italy.

In 1989, he began his theological studies, eventually completing master and doctoral degrees as well as a specialization in theology and ecology at the Faculty of Theology, University of St. Michael’s College, a member school of the Toronto School of Theology at the University of Toronto.

Since 2002, he has been a faculty member of the Faculty of Theology at the University of St. Michael’s College, and the Director of the Elliott Allen Institute for Theology and Ecology, directing many theses on various aspects of eco-theology and ethics.

He is also an associate member of the graduate faculty at the School for the Environment at the University of Toronto where he has co-taught courses on the environment and health. Since 2004, he has been a core faculty member of the certificate programme in Corporate Social Responsibility at the University of St. Michael’s College. Dr. O’Hara has delivered popular and academic lectures in Canada, the USA, Europe and Korea on healthcare, ethics, ecological spirituality, and ecological theology.


  • Theology and Ecology
  • Spirituality and Ecology
  • Ecotheology including eco-spirituality
  • Eco-ethics and eco-feminism
  • Ethics including Christian ethics, biomedical ethics, ecological ethics, business/corporate ethics and ethical leadership

Recent Publications

Articles in peer-reviewed journals:

  • O'Hara, Dennis Patrick. "Awakening to a Spirituality that responds to the Ecological Crisis." Bibliotheca Ephemeridum Theologicarum Lovaniensium 262 (2013): 119 – 126.
  • Hrynkow, Christopher and Dennis O'Hara, "Earth Matters: Thomas Berry, the Pacificism of Religious Cosmology and the Need for Ecojustice." Journal for Peace and Justice Studies 22, no. 2 (Fall 2012): 3-28.
  • Hrynkow, Christopher and Dennis O'Hara. "The Vatican and Ecospirituality: Tensions, Promises and Possibilities for Fostering and Emerging Green Catholic Spirituality." Ecozon@ 2, no. 2 (2011): 177 – 197.
  • O'Hara, Dennis Patrick and Allen Abelsohn. "Ethical Response to Climate Change." Ethics and the Environment  16, no. 1 (June 2011): 25 – 50.
  • Boon, Heather; Verhoef, Marja; O'Hara, Dennis; Findlay, Barbara. "Integrative Health Care: Arriving at a Working Definition." Alternative Therapies in Health and Medicine 10, no. 5 (Sep/Oct 2004): 48-56.
  • Boon, Heather; Verhoef, Marja; O'Hara, Dennis; Findlay, Barbara. "From Parallel Practice to Integrative Health Care: A Conceptual Framework." BMC Health Services Research 4 (2004).


  • O'Hara, Dennis Patrick. "Thomas Berry’s Understanding of the Psychic-spiritual Dimension of Creation: Some Sources." Chapter in To Live in a Cosmos: The Intellectual Roots of Thomas Berry, edited by Heather Eaton. Lanham, MD: Lexington Books, 2014.
  • O'Hara, D. "Thomas Merton and Thomas Berry: Reflections from a Parallel Universe." Chapter in Human Actions at the Intersection of Science and Religion, ed. Sara Fletcher Harding and Nancy Morvillo, volume IV. Religion and Science: Critical Concepts in Religious Studies. 362 – 372. London: Routledge, 2010.
Teaching Level(s) College(s) Status
Basic Degree
St. Michael's College Regular Faculty