M. Robert Mulholland Jr. (1936-2015) was emeritus professor of New Testament at Asbury Theological Seminary and the author of several books, including , , and the landmark spiritual formation book . He also served as pastor of Shirley Community Church in Shirley Mills, Maine. During his extensive academic career, Mulholland served as adjunct professor at the Academy for Spiritual Formation and taught at several seminaries and universities around the world, including Wesley Theological Seminary, Harvard University, McMurry University, Moscow Evangelical Christian Seminary (Moscow, Russia), West Africa Theological Seminary (Lagos, Nigeria) and Baltic Mission Center Theological Seminary (Tallinn, Estonia). An elder in the Kentucky Conference of the United Methodist Church, Mulholland was a frequent speaker at Bible and spiritual renewal conferences. He and his wife, Lynn, have two children.
Ruth Haley Barton (DD, Northern Seminary) is founding president of the Transforming Center, a spiritual formation ministry to pastors and Christian leaders. A trained spiritual director (Shalem Institute for Spiritual Formation), teacher and retreat leader, she has served on the pastoral staff of several churches, including Willow Creek Community Church. A sought-after teacher, preacher and consultant to leadership teams, she is currently adjunct professor of spiritual transformation at Northern Seminary. Educated at Wheaton College, Northern Seminary and Loyola University Chicago Institute for Pastoral Studies, Ruth is the author of numerous books and resources on the spiritual life, including and . She is also the author of an online resource titled spiritual guidance via e-mail. She contributes regularly to