Gregory Ponthiere is a Professor of Economics and Philosophy at the Hoover Chair in Economic and Social Ethics, UCLouvain, and an Editor of the Journal of Population Economics. Before joining UCLouvain, he held permanent positions at the Ecole Normale Superieure and at the University Paris XII, and was an Associate Researcher at the Paris School of Economics. His research focuses on relations between economic and demographic outcomes, from a positive perspective (rationalization of stylized facts) and a normative perspective (design of a fair Welfare State). His publications include three books and articles in journals such as the Journal of Economic Theory, the International Economic Review, Social Choice and Welfare and the Journal of Public Economics. He is an Honorary Fellow of the Institut Universitaire de France.