The warrens were American paranormal investigators and authors associated with prominent cases of alleged hauntings. Edward was a self-taught and self-professed demonologist, author, and lecturer. Lorraine professed to be clairvoyant and a light trance medium who worked closely with her husband.
In 1952, the Warrens founded the New England Society for Psychic Research (NESPR), the oldest ghost hunting group in New England. They authored many books about the paranormal and about their private investigations into various reports of paranormal activity. They claimed to have investigated well over 10,000 cases during their career. The Warrens were among the first investigators in the Amityville haunting.
Stories of ghost hauntings popularized by the Warrens have been adapted as or have indirectly inspired dozens of films, television series and documentaries, including several films in the Amityville Horror series and the films in The Conjuring universe.