American psychologist, amateur magician and leading critic of parapsychology, co-founder of the Committee for the Scientific Inquiry (CSI).

James Hervey Hyslop (1854-1920) was a professor of philosophy, a psychologist, and, during the last fifteen years of his life, a dedicated psychical researcher.

Irish journalist, author and broadcaster (1916-1993), whose many published works include books about psychical research.

British preacher and philosopher (1860-1955) who was interested in psychical research and wrote about issues arising from claims of postmortem survival.

Robert Jahn was a plasma physicist who made notable contributions to the science of rocket propulsion and founded  the PEAR anomalies research laboratory, specializing in the study of mind-machine interaction.

The American philosopher and psychologist William James (1842-1910) is one of the most eminent academic figures to have been involved in psi research.

CEM Joad  (1891-1953) was a British philosopher and television personality with an active interest in psychical research.

Cambridge zoologist (1860-1940) who played a significant role as researcher and administrator in the early years of the Society for Psychical Research.

English physicist (1901-1987), author of books about psychical research, survival of death and mysticism.

Jacob Jolij is a Dutch psychologist who has carried out experiments in presentiment and psychokinesis.