Sanjay is a Research Fellow at the National Centre for Immunisations Research and Surveillance (NCIRS). He is a Medical Epidemiologist in the team at NCIRS that provides evidence-based technical support to Australian Technical Advisory Group on immunisation (ATAGI) in the development of vaccination related policy. He is a part-time PhD student in the Discipline of Child and Adolescent Health of Sydney University Medical School. His PhD project involves assessment of the effectiveness of pneumococcal vaccinations in Australian children and exploring, using a data-linkage method, the association of risk factors with increased susceptibility to invasive pneumococcal disease in children. In addition to infectious disease epidemiology he also has extensive experience as a health services researcher in the areas of quality and safety of healthcare for the elderly, evaluation of complex system interventions, and assessment of provider and consumer perspectives of healthcare. He has a particular interest in appraisal of large administrative and clinical databases for research and use of linked data to inform clinical practice and policy. He also has worked as a clinical practitioner in Sri Lanka and Australia.