Cavanaugh's series of fiction, An American Family Portrait, is an award-winning work of historical novels. Following in line with his work on secular fiction, Cavanaugh has penned fiction that is popular in the Christian fiction market, his The Book of Books series. In it he traces the development of the Bible in the English language, telling of events surrounding the decision to translate the Bible, despite opposition from the church.
Cavanaugh is a preacher and popular inspirational speaker. He and his wife Marni live in Southern California.