Trevor is the Director of the Centre for International Child Health at University of Melbourne and RCH and Deputy Director of the ICU and Clinical Director of the general ICU at RCH and has broad experience in all aspects of child health in developing countries. 

Trevor also holds an appointment as an Adjunct Professor of Child Health in the School of Medicine at the University of Papua New Guinea, is a member of the PNG National Department of Health Child Health Advisory Committee, and previously worked as a provincial paediatrician in Goroka. During the three and a half years that Trevor headed the paediatric ward in Goroka the hospital's child mortality rate was cut in half. Trevor is on the Child Health Advisory Committee of the National Department of Health and continues to work closely with paediatricians in the Solomon Islands, Indonesia and Fiji. 

Trevor heads the World Health Organisation Collaborating Centre for Research and Training in Child and Neonatal Health, and co-principle of AusAID Knowledge Hub for Womens and Children's Health. He is involved in designing and implementing the WHO / UNICEF Child Survival Strategy, and the International Child Health Review Collaboration (www.ichrc.org), and he was an author and editor of the WHO Pocketbook of Hospital Care for Children, which has been translated into more than a dozen languages and is used in over 30 developing countries. Trevor annually compiles the publication Randomised Trials in Child Health in Developing Countries 

Trevor’s particular research interests include the epidemiology and case management of acute respiratory infections, improving the quality of paediatric care in district and provincial hospitals, oxygen and hypoxaemia, disease surveillance and auditing, neonatal illness, meningitis, and childhood tuberculosis.