David Wiesner

Bertold Paul Wiesner (1901–1972) was an Austrian-born physiologist. He is noted for coining the term 'Psi' to denote parapsychological phenomena; for his research into human fertility and the diagnosis of pregnancy; and for being the biological father of more than 600 people by anonymously donating sperm used by his wife the obstetrician Mary Barton to perform artificial insemination on women at her private practice in London.