He trained in London and in Sydney and was consultant at Great Ormond Street Hospital for Children for 5 years before returning to Sydney. He specializes in children who have chest problems such as cough, asthma, chest infections and rare lung diseases. He has published over 250 research papers on children with lung disease. He is chairman of the NSW Department of Health, Aiming for Asthma Improvement in Children Program, he chairs Asthma Australia’s Research Advisory Committee and Rare Voices Australia’s Scientific and Medical Advisory Committee. His patients have access to one of the best respiratory diagnostic laboratories in the world at Sydney Children’s Hospital. He is an acknowledged expert in flexible bronchoscopy.