Professor Graham Cookson is the chief executive of OHE, the world’s oldest independent health economics research organisation. An econometrician by training, Graham focuses on health system efficiency, policy evaluation, and pricing and reimbursement in pharmaceutical markets. Through OHE’s Change Initiative, Graham leads pioneering research programmes on sustainability and prevention. He is best known for his work on the economics of staffing and skill mix in the English NHS, which was critical to the development of the NICE Guidelines on Safe Staffing. Graham was educated at Oxford and Imperial College London and is now an Honorary Professor at City, University of London.