- The Community of Religions: Voices and Images of the Parliament of World's Religions(1996, edited with George Cairns)
- The Mystic Heart: Discovering a Universal Spirituality in the World's Religions (1999)
- A Monk in The World: Cultivating a Spiritual Life (2002)
- Bede Griffiths: An Introduction to His Interspiritual Thought (2003)
- Awakening the Spirit, Inspiring the Soul: 30 Stories of Interspiritual Discovery in the Community of Faiths (2004, edited with Martha Howard)
- The Mystic Hours: A Daybook of Interspiritual Wisdom and Devotion (2004)
Audio Books
- Living the Mystical (2000)
- Hermitage of the Heart (2003)