Zeynep Or, PhD is an economist and research director at the Institute for Research and Information in Health Economics (IRDES, Institut de Recherche et Documentation en Economie de la Santé). She is also an affiliated professor to the University Paris-Dauphine. Her main research interests, are health system performance from an international comparative perspective, which cover analysis of efficiency, equity and health care quality, and health policy evaluation. She has published extensively on the measurement and determinants of variations in health care utilisation, efficiency and quality of hospital services within and across countries, and the interaction between institutional and policy settings and health system performance. She is an active member of several international networks such as European Observatory of Health Systems and Policy Monitor, European Health Policy Group, Wennberg International Collaboration.