Francis Bacon (1561-1626), a pioneer of science, was widely believed to have been sceptical of psychic phenomena. In fact he believed some were real, but opposed their investigation on theological grounds. 

British psychologist and prominent psi sceptic working at Goldsmiths, University of London. French frequently appears in the media as a critic of psychic claims, but has also carried out laboratory psi research.

Pioneering Japanese experimental psychologist (1869-1952) who also carried out psi research, noted in particular for experiments in ‘thoughtography’.

American critic of parapsychology and paranormal claims (1914-2010), considered to have been a founding member of the modern sceptical movement. 

Hamlin Garland (1860-1940) was an American writer and psychical researcher, noted for his investigation of the Buried Crosses episode.

British psychologist, well-known in the psi research community for his investigations and commentary, notably in the areas of poltergeists, mediumship and the early history of psychical research.

French investigator of mediums (1865-1924) remembered for his controversial attempts to provide proof of ectoplasm in the form of plaster moulds. 

Mostyn Gilbert (1924-1992) was an American historian, living mostly in England, who pursued interests in physical mediumship and survival phenomena.

Seventeenth century clergyman (1636-1680) and member of the Royal Society, one of the first intellectuals to take a scientific interest in paranormal claims.

Jacob Glazier is a transdisciplinary researcher based at the University of West Georgia. His scholarship includes critical theory and parapsychology.