David Emerson is the director of yoga services at the Trauma Center (traumacenter.org). In 2003 he codesigned the Trauma Center Yoga Program that includes classes and teacher training programs. He lives in Cambridge, MA. Elizabeth Hopper, PhD, is a licensed clinical psychologist specializing in traumatic stress and works as the associate director of training at the Trauma Center. She lives in Somerville, MA.
Stephen Cope is a psychotherapist and senior yoga teacher at the Kripalu Center for Yoga and Health in Lenox, Massachusetts, the largest residential yoga center in the United States. An Amherst College graduate with further studies at Episcopal Divinity School and Boston College, he is Kripalu's Scholar-in-Residence and is featured on the bestselling Kripalu "Dynamic Yoga" video.