His main research area is the economic evaluation of infectious disease prevention strategies, as well as the mathematical modelling and statistical analyses that inform these evaluations. He has over 40 peer-reviewed publications on a range of vaccine preventable diseases, including the epidemiology and cost-effectiveness of prevention strategies for influenza (seasonal and pandemic), pneumococcal disease, rotavirus, and human papillomavirus. He has been appointed to the World Health Organization (WHO) Roster of Experts in the area of Health Economics by the Director-General of the WHO.