I am Professor of Finance at HEC Paris where I hold a chair from the HEC Foundation and a research fellow of the Centre for Economic Policy (CEPR). I hold a Ph.D in Finance from HEC and I have taught in various international institutions (e.g., Universitat Pompeu Fabra, Carnegie Mellon University, Ecole Polytechnique Fédérale de Lausanne, Studienzentrum Gerzensee, Saïd Business School in Oxford, the Tinbergen Institute etc.). My research focuses on the determinants of financial markets liquidity, the industrial organization of these markets, and their effect on the real economy. It is published in leading scholarly journals such as Journal of Finance, Review of Financial Studies, or Journal of Financial Economics. I have received research awards from the Louis Bachelier Institute, the HEC Foundation, and the Analysis Group award for the best paper on Financial Markets and Institutions presented at the 2009 Western Finance Association (WFA) meetings. I serve or served on the scientific committees of the Autorité des Marchés Financiers (AMF), the Norwegian Finance Initiative (NFI), the Research Foundation of the Banque de France, the Group of Economic Advisors of the Committee of Economic and Markets Analysis of the European Securities and Markets Authority (ESMA) and was a member the executive committee of the European Finance Association (EFA). I am currently an Editor of the Review of Asset Pricing Studies (RAPS), and an Associate Editor of the Journal of Economic Theory and the Journal of Finance, and a fomer Associate Editor of The Review of Financial Studies. I also served as co-editor of the Review of Finance from 2009 to 2013. I co-authored, with Marco Pagano and Ailsa Röell, “Market Liquidity: Theory, Evidence and Policy” , a textbook on market liquidity published by Oxford University Press in 2013.