- 366 Celt: A Year and a Day of Celtic Lore and Wisdom (2005)
- The Big Book of Christian Mysticism: The Essential Guide to Contemplative Spirituality (2010)
- Answering the Contemplative Call: First Steps on the Mystical Path (2013)
- Befriending Silence: Discovering the Gifts of Cistercian Spirituality (2015)
- Christian Mystics: 108 Seers, Saints, and Sages (2016)