The Psi Encyclopedia is a collection of articles and case studies about psi research, the scientific investigation of psychic phenomena. It's a work in progress, being created by the Society for Psychical Research in London. Learn more >

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English mathematician, physicist and radio engineer (1879-1952), actively involved in psychical research and noted for his commentary on the topic of apparitions.

British-born psychical researcher and author (1880-1958) resident in the USA, noted in particular for his participation in a landmark investigation of the physical medium Eusapia Palladino. 

English architect and archeologist  (1864-1945) remembered for claims that archeological discoveries at Glastonbury Abbey were achieved through contacts with deceased monks.

English psychiatrist and author (1905-1992) who attracted notice in the 1970s with books claiming the group reincarnation of members of the Cathars, a medieval French Christian sect.

Spiritualist organization based in London, offering mediumship training and educational courses related to consciousness, healing and the psychic arts.