Awarded the Nobel Prize for Economics in 2000 thanks to his contribution to developing theory and methods for the analysis of selective samples, he is a Professor at the University of Chicago. His main areas of research focus on the origin of inequality, the evaluation of social programmes, models for discrete econometric choices, public economics, alternative patterns of income distribution and heterogeneity in general patterns of balance. He chairs numerous scientific committees and has received the most important international awards. His latest publications include: Inequality in America: What Role for Human Capital Policy, with A. Krueger, MIT Press (2003) and Law and Employment: Lessons From Latin America and the Caribbean, with C. Pages, University of Chicago Press (2004).