Thomas Ryan is director of the North American Paulist center in Washington, D.C.  He is the author of Prayer of Heart and Body: Meditation and Yoga as Christian Spiritual Practice. He is also the editor of Reclaiming the Body in Christian Spirituality.

Celia Rothenberg is an assistant professor of religious studies at McMaster University in Hamilton, Ontario, Canada. She contributed an article on three forms of Jewish yoga practiced in North America to the November 2006 edition of the journal Nova Religio.

P. Aneesah Nadir is founder of Dr. Aneesah Nadir and Associates and a retired professor of social work at Arizona State University in Tempe.

The Rev. Nancy Roth is an Episcopal priest in Oberlin, Ohio, and author of several books on unusual forms of Christian prayer, including Spiritual Exercises: Joining Body and Spirit in Prayer and An Invitation to Christian Yoga, both published in 2005.

Sybil MacBeth is the author of Praying in Color: Drawing a New Path to God, published in 2007. She conducts workshops in drawing and painting as prayer.

Liz Lerman is a choreographer, founder of the  Liz Lerman Dance Exchange and MacArthur Fellowship recipient. Among her most recent works is 613 Radical Acts of Prayer, which takes its name from the Talmudic laws and explores the nature of prayer. The dance company is based in Takoma Park, Md.

Diane Bloomfield is the author of Torah Yoga, a Jewish-themed yoga book and program that she teaches in the U.S. and Israel. She also founded the Torah Yoga Association. She gave a Beliefnet.com interview on the intersection of Judaism and yoga.

Coleman Barks is a retired professor of creative writing and poetry at the University of Georgia and author of several books on Rumi and Sufism. He can discuss the prayer embodied in the dance of the Sufi dervish. He lives in Athens, Ga.

The Rev. Lauren Artress is an Episcopal priest at Grace Cathedral in San Francisco, where she oversees the use of two permanently installed labyrinths. She is the founder of Veriditas, which describes itself as “the voice of the labyrinth movement.” Dr. Artress travels and teaches people how to pray while walking a labyrinth.