Traugott Konstantin Oesterreich
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. Provided by Wikipedia