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Professor Hahn is a Professor of economics at UCLA, and held previous appointments at the Universities of Pennsylvania, Michigan and Brown. He is a theoretical econometrician and develops methodologies to analyze micro-econometric data, i.e., data on many economic agents. His past work mathematically characterizes the amount of information contained in various econometric models and variables. His recent work concerns panel data models. He has been Co-Editor of Econometric Theory and Associate Editor of Econometrica and the Journal of Econometrics.