My main area of research is macroeconomic theory but I work in a variety of areas, including game theory (mostly aggregative games), dynamics (e.g. turnpike theory), economic history, and computational economics. My recent/current projects are on the Bubonic Plague and its impact on British economic development in the Late Middle Ages and Early Modern Era; behavioral macro; and on a class of models called Large Dynamic Economies (LDEs). LDEs include models with borrowing constraints, uninsurable risk, and also models of firm dynamics and occupational choice models. Together with Daron Acemoglu, I am currently working on extending this framework to allow for aggregate uncertainty and various behavioral features. These issues are closely related to my more theoretical work on distributional comparative statics and functional diversity; which asks how distributions (of agents' characteristics; or income, uncertainty, private information, etc.) relate to and determine economic outcomes. For example, the relationship between income inequality and aggregate savings in an economy is a distributional comparative statics question; and the question of whether a more diverse team will outperform a homogenous team (or vice versa) relates diversity to economic outcomes.
My other professional activities and affiliations are: Deputy Director of Research. External Examiner at London School of Economics (MSc). Associate fellow, CRETA. Fellow, Novo Tempus (University Paris 1, Pantheon-Sorbonne). Expert Reviewer of Grant applications for the NSF (USA), ISF (Israel), FCT (Portugal), and the ANR (France). Chair of the 2015/16/17 US/UK Job Market Committee. Foreign Expert Evaluator at Quaid-i-Azam University, Islamabad. I am a referee at the following mathematics and engineering journals: Discrete Applied Mathematics, European Journal of Operational Research, IEEE Journal of Automatic Control, Journal of Global Optimization, Mathematics of Operations Research, Operations Research, Order, Optimization Letters; as well as at the following economics journals: American Economic Review, AEJ Micro, the BE Press Theory Suite, Bulletin of Economic Research, Econometrica, Economic Theory, Games and Economic Behavior, International Economic Review, International Journal of Game Theory, Journal of Economic Theory, Journal of Mathematical Economics, Journal of Political Economy, Journal of Public Economics, Journal of Public Economic Theory, Macroeconomic Dynamics, Mathematical Social Sciences, Quantitative Economics, Review of Economic Studies, and Theoretical Economics.