Andreu Mas-Colell is Professor of Economics at Pompeu Fabra University (currently on leave). After receiving his PhD in Economics from the University of Minnesota, he stayed on in the United States for almost 25 years, teaching and researching at UC Berkeley and Harvard. He is author of over one hundred papers on subjects that range from general equilibrium theory and the structure of financial markets to the pricing policies of public firms, by way of strategic game theory. A past editor of Econometrica and other journals, he is a Fellow of the Econometric Society, serving as its president in 1993, a Foreign Associate of the U.S. National Academy of Sciences, a past president (2006) of the European Economic Association, and 2009 BBVA Foundation Frontiers of Knowledge laureate in Economics, Finance and Management. He has served as Secretary General of the European Research Council, and as Minister of Economy and Knowledge with the Catalonian Government.