Demonic Foes: My Twenty-Five Years as a Psychiatrist Investigating Possessions, Diabolic Attacks, and the ParanormalThe worlds leading psychiatric authority on demonic possession delves into the hidden world of exorcisms and his own transformation from cynic to believer over the course of his twenty five year career. Successful New York psychiatrist Richard Gallagher was skeptical yet intrigued when a hard nosed, no nonsense Catholic priest asked him to examine a woman for a possible exorcism. Meeting her, Gallagher was astonished. The womans behavior defied logic.