Father Brian Nolan talks with Monsignor Stephen Rossetti about exorcism and avoiding the power of evil. Monsignor Rossetti is the author of Diary of an Exorcist: Demons, Possession, and the Modern-Day Battle Against Ancient Evil, president of the St. Michael Center for Spiritual Renewal and a research associate professor at The Catholic University of America in Washington, D.C. A licensed psychologist, he has participated in hundreds of exorcisms.