Ptolemy Tompkins is a former editor at Guideposts Magazine and the author of seven books. His writing has been featured in Beliefnet, Harper’s, The New York Times, the Los Angeles Times, The Best Spiritual Writing, and The Best American Spiritual Writing.

Bernard Haisch, PhD is an astrophysicist and author of more than 130 scientific publications. He was a scientific editor of the Astrophysical Journal for ten years. His has been deputy director of the Center for Extreme Ultraviolet Astrophysics, the University of California at Berkeley and visiting scientist at the Max-Planck-Institute in Garching, Germany. He lives in the San Francisco Bay Area with his wife, Marsha Sims, and three children.