Brazilian psychologist whose research interests include anomalistic psychology, hypnosis and altered states of consciousness.

American psychologist, parapsychologist and educator (b 1951) whose research has included ESP experiments, survey studies of psi experiences, and examinations of parapsychology texts from a science studies point of view.  

Dutch psychical researcher and commentator (1898-1990), chiefly remembered for his many books and articles on parapsychological topics.