Spiritualists

Rudi Schneider (July 27, 1908 – April 28, 1957), son of Josef Schneider and brother of Willi Schneider, was an Austrian Spiritualist and physical medium. His career was covered extensively by the Journal of the American Society for Psychical Research, and he took part in a number of notable experiments conducted by paranormal researchers/debunkers, including Harry Price, Albert von Schrenck-Notzing and Eric Dingwall. Some of these researchers declared him to be a fraud while others were unable to find evidence of trickery.

Gerard Croiset (né Boekbinder; March 10, 1909 – July 20, 1980) was a Dutch parapsychologist, psychometrist and psychic. He was often asked to help police detectives trace missing persons, though authenticated successes were few, and compared against the failures, his success rate was ruled no better than chance.