Pierre-Olivier Weill is Professor of Economics at the University of California, Los Angeles (UCLA), Research Associate at the National Bureau of Economic Research (NBER), Research Affiliate of the Center for Economic Policy Research (CEPR), and Fellow of the Econometric Society. Prior to joining UCLA, he was Assistant Professor of Finance at the NYU Stern School of Business. Pierre-Olivier Weill’s research has focused on a variety of topics in financial, macro, urban, and monetary economics. His work has been published in leading economics and finance journals, such as the American Economic Review, Econometrica, the Journal of Political Economy, the Review of Economic Studies, the Journal of Finance, and the Review of Financial Studies. Several of his contributions focused on liquidity in Over-the-Counter financial markets. In this area, he has analyzed and quantified theoretical frameworks to study a variety of substantive questions, such as the equilibrium and socially optimal liquidity provision of dealers, the cross-sectional pricing of liquidity and the associated deviations from the law of one price, the formation of transaction costs, the origin and fragility of intermediation activity. He currently is Co-Editor at Theoretical Economics. He held editorial roles at Econometrica, the Review of Economic Studies, the Journal of Economic Theory, and the Review of Economic Dynamics. He received his BS from Ecole Polytechnique in Paris in 1997, and his PhD from PhD Stanford University in 2004.