Oxford classics professor (1893-1979), an authority on supernatural beliefs in antiquity. His 1934 paper ‘Why I Do Not Believe in Survival’ has been frequently cited.

Air Chief Marshal Hugh Dowding (1882-1970), head of RAF Fighter Command during the Battle of Britain, was later involved in spiritualist activities, authoring several books.

In later life, the creator of Sherlock Holmes became an evangelist for spiritualism. 

German biologist and philosopher (1867-1941) who published extensively on psychical research, considering it to be empirical support for his theory of vitalism.

German philosopher (1839-1899), a prominent theoretician and proponent of research into postmortem survival, psychic phenomena and the unconscious mind. 

 American philosopher who in 1961 published a major study of psi phenomena, endorsing their existence and arguing that they constitute evidence for postmortem survival. This article describes and critiques his ideas. 

Manager of the Princeton Engineering Anomalies Research (PEAR) laboratory (1944–2022), whose remote viewing and psychokinesis research made important contributions to parapsychology.

JW Dunne (1875-1949) was an Anglo-Irish soldier and aeronautical engineer who became well-known as the author of books about time and dream precognition.

 Professor of philosophy at Rollins College, Orlando, Florida, who has carried out psi research, principally in the area of psychokinesis.

American lawyer, judge, and politician (1799–1874), remembered as one of the first serious investigators of séance mediums.