Together with his wife, Ursula, and their assistant, Tom Green, he produced many notable olympians such as Shane Gould, Karen Moras, Gail Neall, John Davies, Terry Gathercole, John Ryan and Ian O'Brien.
Gathercole then became a coach, beginning as an assistant to Forbes Carlile.
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After winning all the breaststroke events at the country championships, O'Brien was taken by his father to the Ryde pool in Sydney in 1960, to be coached by Forbes Carlile and his assistant, retired world record-breaking breaststroker Terry Gathercole.