Traugott Konstantin Oesterreich (15 September 1880, in Stettin (Szczecin) – 28 July 1949, in Tübingen) was a German religious psychologist and philosopher.
Oesterreich was also interested in parapsychology. He argued against the philosophy of materialism.He was the author of Die Besessenheit (1921), a book on demonic possession. It was translated into English in 1966. William Peter Blatty, author of The Exorcist, was influenced by the book.
Julian Leopold Ochorowicz (Polish pronunciation: ['juljan lɛˈɔpɔld ɔxɔˈrɔvit͡ʂ]; outside Poland also known as Julien Ochorowitz; Radzymin, 23 February 1850 – 1 May 1917, Warsaw) was a Polish philosopher, psychologist, inventor (precursor of radio and television), poet, publicist, and leading exponent of Polish Positivism.
Hans Adolf Eduard Driesch (28 October 1867 – 17 April 1941) was a German biologist and philosopher from Bad Kreuznach. He is most noted for his early experimental work in embryology and for his neo-vitalist philosophy of entelechy. He has also been credited with performing the first artificial 'cloning' of an animal in the 1880s, although this claim is dependent on how one defines cloning.
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.
Hans Bender (5 February 1907 – 7 May 1991) was a German lecturer on the subject of parapsychology, who was also responsible for establishing the parapsychological institute Institut für Grenzgebiete der Psychologie und Psychohygiene in Freiburg. For many years his pipe smoking, contemplative figure was synonymous with German parapsychology. He was an investigator of 'unusual human experience', e.g. poltergeists and clairvoyants. One of his most famous cases was the Rosenheim Poltergeist.