Guy Lyon Playfair was a British author and parapsychologist, best known for his work in the field of psychical research. He gained prominence for his investigations into poltergeist phenomena and was a key figure in the study of anomalous experiences. Playfair authored several books, including "This House is Haunted," which detailed his experiences with paranormal events. In addition to his writing, Playfair was a member of the Society for Psychical Research and contributed to various academic discussions on the subject. His work aimed to explore the boundaries of human consciousness and the potential for extrasensory perception.