His research interests include the social and environmental determinants of population health and health inequalities; evaluation of complex population health interventions, complex systems thinking, use of natural experiments in evidence-based policy, and the research-policy interface. Much of this work focuses on improving diet and increasing physical activity; reducing obesity and diabetes; and improving psychological wellbeing. Externally he serves on: The Movember Foundation Global Men's Health Advisory Committee, Health & Social Care Northern Ireland Doctoral Fellowships Panel (Chair), NordForsk Scientific Advisory Board on Health & Welfare, NIHR Doctoral Fellowships Programme Panel and the Cancer Research UK Expert Review Panel on Prevention.