Bertold Paul Wiesner (1901 - 1972) was an Austrian Jewish physiologist noted firstly for coining the term 'Psi' to denote parasychological phenomena; secondly for his contribution to research into human fertility and the diagnosis of pregnancy; and thirdly for being biological father to an estimated 600 offspring by anonymously donating sperm used by his wife the obstetrician Mary Barton to perform artificial insemination on women at a private clinic on Harley Street.