Dallas Willard (1935–2013) was an American philosopher who was also well-known for his writings on Christian spiritual formation. He was a longtime professor of philosophy at The University of Southern California. In addition to teaching and writing about philosophy, Willard lectured and wrote books about Christianity and Christian living. Christianity Today named his book The Divine Conspiracy Book of the Year for 1999. Another of his books, Renovation of the Heart, won Christianity Today's 2003 Book Award for books on spirituality.
Trevor Hudson is a Methodist minister, pastoral therapist, and retreat leader in Benoni, South Africa. He is the author of several books, including Hope Beyond Your Tears, The Serenity Prayer, One Day at a Time, and A Mile in My Shoes. Hudson travels widely to conduct conferences, workshops, and retreats.