| 2009 | Co-translated, with an introduction, Letters of René Daumal on the Search for Awakening 1930-1944, Dolmen Meadow Editions (Toronto) |
| 2008 | “Monsieur Gurdjieff et Monsieur Daumal,” in B. Nicolescu and J.-Ph de Tonnac, eds., René Daumal ou le perpétuel incandescent, Le bois d’Orion, France |
| 2007 | Introduction to Ananda K. Coomaraswamy, Figures of Speech or Figures of Thought? The Traditional View of Art, William Wroth, ed., World Wisdom, Bloomington (Indiana) |
| 2006 | Angelic Mistakes: The Art of Thomas Merton, Shambhala Publications / New Seeds, Boston and London |
| 2003 | The Invisible Thread: Buddhist Spirit in Contemporary Art, co-curator of the exhibition at Snug Harbor Cultural Center and author of one of the introductory essays |
| 2001 | Have you been to Delphi? Tales of the Ancient Oracle for Modern Minds, State University of New York Press, Albany (New York) |
| 1988 | An Art of Our Own: The Spiritual in Twentieth-Century Art, Shambhala Publications, Boston (paperback, 1989; reissued 2004, under the subtitle, by Dover Books)—cf. chapter on Dag Hammarskjöld as an enlightened art patron at UN headquarters |
| 1981 | Daedalus: Studies in Honor of the Birth Centenary of Ananda K. Coomaraswamy, Institute of Indian Art History, Dharwar (India) |
| 1977 | Coomaraswamy: Selected Papers, in two volumes (1: Traditional Art and Symbolism; 2: Metaphysics), edited with an introduction, Bollingen Series, Princeton University Press (a selection with the introduction appeared in Italian, 1987, Adelphi Edizioni, under the title Il grande brivido: Saggi di simbolica e arte) |
| 1977 | Coomaraswamy: Life and Writings, Bollingen Series, Princeton University Press |
