Tim Yancey is a violent haunting survivor. He was also friends with George Lutz who owned the allegedly haunted house in Amityville that the book and movie "Amityville Horror" was based on. Yancey, is a paranormal investigator and a prayer chaplain at the church he attends in Palm Beach, Florida. He works with families who have experienced or a re experiencing violent hauntings.
See the interview here.