 He worked at the Royal Prince Alfred Hospital in Sydney until 1970, and then was a Retinal Research Fellow at Harvard Medical School from 1970 to 1971.He was a Clinical Retinal Fellow at the Massachusetts Eye and Ear Infirmary in Boston from 1971 to 1972 and an instructor in ophthalmology at Harvard from 1974 to 1975.In 1975 he was the Foundation Lions Professor of Ophthalmology at the University of Western Australia, and in 1983 he was the Foundation Director of the Lions Eye Institute.