Born on 3 September 1908, Tony Green studied medicine at Otago University before coming to England in 1935 to specialise in radiotherapy. He held a number of junior posts and studied at the Radium Institute. A firm belief of his was that the effective treatment of malignancy should cause as little upset to the patient as possible. He set up the radiotherapy unit at the Royal Northern Hospital where he developed the widely publicised system of *Track and Kill*, a method by which the radiation beam was made to follow the likely cause of neoplastic infiltration. Later he became a consultant at the Royal Free Hospital. He helped to found and raise funds for the Society for the Early Detection of Cancer, as he believed that early detection was a most important factor governing long-term survival. In retirement he pursued his hobby of horticulture, to which he applied his mechanical inventiveness and knowledge of automation. He twice won prizes for his irises at the Chelsea Flower Show. He died on 3 September 1993, survived by his wife, Susan, two sons (one of whom, Gavin, is an orthopaedic surgeon) two daughters and ten grandchildren.