Jimmy Evans is a longtime pastor, Bible teacher, and bestselling author. He is also the founder and president of XO Marriage, a ministry devoted to helping couples thrive in strong and fulfilling marriages. He is the author or coauthor of more than fifty books, including Marriage on the Rock, The Four Laws of Love, Lifelong Love Affair, 21 Day Inner Healing Journey, and Tipping Point. Jimmy and his wife, Karen, have been married for fifty years and have two married children and five grandchildren. Learn more at XOMarriage.com.

Frank Martin is the author or coauthor of nineteen books, including Lifelong Love Affair, Furious Pursuit, and Embracing Eternity. A frequent collaborator, he has written books with such notable personalities as Nicky Cruz, Jerry Jenkins, Tim LaHaye, Dr. O. S. Hawkins, Wally Armstrong, and Dr. Robert Schuller. He has written articles for numerous magazines, including Marriage Partnership, Discipleship Journal, and Pray! and served for twenty years as a family commentary writer for Focus on the Family. He lives in Colorado Springs, Colorado, with his wife, Ruthie, and their two children. For more information, please visit www.frankmartin.net.