His research interests are in disease modelling and evidence synthesis. He has held visiting appointments in Bayesian groups in Australia and the United States. He contributes to the statistical societies in the U.K. and Ireland and is currently Theme Director and a member of the Council of the Royal Statistical Society. He is a Statistical Editor for the Cochrane Collaboration and has served as Associate Editor for statistics journals. He is an advisor to the National Centre for Pharmacoeconomics and a member of the Scientific Advisory Group for the Health Information and Quality Authority.