Richard J. Foster (D.Th.P., Fuller Theological Seminary) is founder of Renovaré in Denver, Colorado. He is the author of many books, including Celebration of Discipline: The Path to Spiritual Growth, which has sold over two million copies worldwide, Prayer: Finding the Heart's True Home, Freedom of Simplicity: Finding Harmony in a Complex World, and coauthor (with Gayle Beebe) of Longing for God: Seven Paths of Christian Devotion. Gayle D. Beebe (Ph.D., Claremont Graduate University) is president of Westmont College in Santa Barbara, California, and past president of Spring Arbor University in Spring Arbor, Michigan. He served as one of the general editors for The Renovaré Spiritual Formation Bible. He is also author of The Interpretive Role of the Religious Community in Friedrich Schleiermacher and Josiah Royce and coeditor of Keeping the Concept in the Social and Natural Sciences; Keeping the Concept in the Philosophical, Practical and Productive Arts; A Concept to Keep; and Religion and Its Relevance in Post-Modernism.