John Zaffis has over forty three years of experience studying and investigating the paranormal. He has had the opportunity to work for and with his aunt and uncle, Ed and Lorraine Warren. This sent John beyond looking for ghosts and hauntings and into studying demonology under the Warrens. This led into John's involvement with cases of possession and exorcism, which gave him the opportunity to work with prominent exorcists in this field, including Roman Catholic priests, monks, Buddhists, rabbis and ministers. John has assisted and worked with well-known exorcists Bishop Robert McKenna, Father Malachi Martin, and the Reverend Jun.