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Mark Keyes, Paranormal Contributor for Paranormal 911 & Haunted Hospitals on Travel Channel and Director of the Pennsylvania Paranormal Association, is a retired PA State Police Detective turned private investigator and parapsychologist. Mark has worked on over 200 paranormal resolution cases over the past 15 years and authored two books, Chasing Shadows and The Upper Darby Poltergeist and has a third book on the way.
