Professor Durrheim is a leading public health advocate, researcher and practitioner in surveillance innovation, outbreak response, and immunisation service improvement in Australia and globally. He is expert adviser to WHO in the African and Pacific Regions. His global standing is exemplified by being appointed to the WHO Strategic Advisory Group of Experts (SAGE) on Immunization, currently serving on two SAGE working groups. David chairs the Australian Polio Certification Committee and Western Pacific Regional Measles Elimination Verification Commission, and is on the Scientific Organizing Committee of the Global Vaccine and Immunisation Research Forum, setting and monitoring the global vaccine research agenda.