Professors Ralph W. Hood and W. Paul Williamson recorded the services of major serpent handling churches in Southern Appalachia and conducted interviews with congregation members and leaders to inform their research in the Psychology departments at the University of Tennessee at Chattanooga and Henderson State University in Arkadelphia, Arkansas respectively. In 2005, the pair, with co-author Peter C. Hill of Biola University, published Them That Believe: The Power and Meaning of the Christian Serpent-Handling Tradition, which relies on the recordings of church services and interviews captured by Hood and Williamson.