A BRITISH scientist may have fathered 600 children after making donations to a fertility programme he ran with his wife.
And one of his biological children has suggested the number may even be as high as ONE THOUSAND.
Bertold Wiesner - who was born in Austria - ran the Barton Clinic in London which helped more than 1,500 women conceive.
Barry Stevens, a film-maker from Canada, was concieved using Wiesner's donated sperm and said the number could be much higher.
He said last night: "He was the one that found the donors so it's possible he didn't tell his wife and she believed the donations were coming from a lot of different men."
Wiesner ran the controversial clinic with his wife Mary - until he died in 1972. Research shows he regularly made donations from the early 1940s until the mid-1960s.
... Last year it emerged that one anonymous American sperm donor had fathered more than 150 children.