Paul has written numerous articles and co-authored or contributed to five other books with authors Brad Steiger, Timothy Green Beckley, Tim Swartz, and others. He is the author of eight books on the paranormal and two on history. Two of his earlier works (Faces at the Window: First-Hand Accounts of the Paranormal in Southern New England, New River Press, 1998; and Footsteps in the Attic: More First-Hand Accounts of the Paranormal in New England, New River Press, 2002) are already considered classics of paranormal literature.

Several of Paul’s cases have made headlines around the world, including the Bridgeport poltergeist outbreak of 1974 and the ongoing Litchfield County (Conn.) paranormal flap. Paul has appeared on the History, Discovery, and Travel Channels.