The Enfield poltergeist was a claim of supernatural activity at 284 Green Street, a council house in Brimsdown, Enfield, London, England, between 1977 and 1979 involving two sisters, aged 11 and 14. Some members of the Society for Psychical Research such as inventor Maurice Grosse and writer Guy Lyon Playfair believed the haunting to be genuine, while others such as Anita Gregory and John Beloff were "unconvinced" and found evidence the girls had faked incidents for the benefit of journalists. Members of the Committee for Skeptical Inquiry, including stage magicians such as Milbourne Christopher and Joe Nickell, criticized paranormal investigators for being credulous whilst also identifying features of the case as being indicative of a hoax.