The Secret History of Western Sexual Mysticism, (Rochester: Inner Traditions, 2008).
Magic and Mysticism: An Introduction to Western Esotericism, (Lanham: Rowman Littlefield, 2007).
The New Inquisitions: Heretic-hunting and the Origins of Modern Totalitarianism (Oxford UP: 2006).
Restoring Paradise: Western Esotericism, Literature, and Consciousness, (SUNY: 2004)
Awakening the Contemplative Spirit, (St. Paul: New Grail, 2004)
Ed., The Wisdom of Meister Eckhart, The Wisdom of Jacob Böhme, The Wisdom of John Pordage (Great Works of Christian Spirituality, Series editor) (New Grail: St. Paul, 2003)
The Way of Native American Traditions (Thorsons/HarperCollins: 2002 reissue)
The Esoteric Origins of the American Renaissance (Oxford University Press: 2001)
Island Farm, (MSU Press: 2000)
Ed., Wisdom’s Book: The Sophia Anthology, (Paragon House: 2000)
Wisdom’s Children: A Christian Esoteric Tradition, (SUNY: 1999)
Ed., The Hermetic Book of Nature, (St. Paul: Grail, 1997)
Gnosis and Literature, (St. Paul: Grail, 1996)
The Mysteries of Love, (St. Paul: Grail, 1995)
Theosophia: Hidden Dimensions of Christianity, (Lindisfarne Press, 1994)
Native American Traditions, (Element, 1994/1995)
[Translations into various languages including those listed below; editions]
Amérindiens qui êtes-vous?: Cultures et traditions Amérindienes, (Saint-Martin-le-vinoux: L’Or du Temps, 1994)
Gli Indiani d’America, (Xenia: Milano, 1994)
American Transcendentalism and Asian Religions (Oxford University Press: 1993)
The Elements of Native American Traditions, (Element: 1993)
Sacred Earth: The Spiritual Landscape of Native America (Inner Traditions: 1992)
Pollen and Fragments: Poetry and Prose of Novalis, (Phanes: 1989)
The Egyptian Mysteries, (Routledge, Kegan Paul: 1988)
Telos: A Novel, (Routledge, Kegan Paul: 1987)
The Philosophy of Magic, Routledge, Kegan Paul: 1986)