Jerry B. Jenkins, writer of the series, is the author of more than 185 books. His books can be found regularly on The New York Times Best Sellers List. He and his wife, Dianna, live in Colorado Springs. Dr. Tim LaHaye was the bestselling author of more than seventy books and coauthor of the popular Left Behind series. Before his death in 2016, he spent more than thirty years in research, study, and pastoral counseling. He and his wife, Beverly, conducted hundreds of family-life seminars on the Spirit-filled life.

Tim was the president of Tim LaHaye Ministries and cofounder of the Pre-Trib Research Center.