British Man ‘Fathered’ 600 Children

He was fruitful; they multiplied. Bertold Wiesner, a British man who founded a London fertility clinic with his wife more than 50 years ago, may have helped hundreds of women conceive using his sperm, according to two men who have researched the clinic. The men, both of whom were conceived at the clinic, conducted DNA tests on 18 other people conceived there, and found that two thirds of them were Wiesner’s progeny. They extrapolated that number out over the around 1,500 babies conceived at the clinic to arrive at their estimate of 600 little Wiesners.