Richard Gallagher, MD, a board-certified psychiatrist, is a professor of psychiatry at New York Medical and a psychoanalyst on the faculty of Columbia University. He graduated from Princeton University, Phi Beta Kappa in classics, and trained as a resident in psychiatry at Yale University School of Medicine. The world’s foremost scientific expert on the subject of diabolic attacks, he has been an active member of the International Association of Exorcists since the 1990s. He lives in Westchester, New York