His research interests centre on the determinants of income inequality and the role of social policy in reducing it. He has published extensively in international journals such as World Development, the Journal of Latin American Studies, Latin American Politics and Society and Latin American Research Review. He is also the co-editor of four books and the co-author of two books with Juliana Martínez Franzoni: Good Jobs and Social Services: How Costa Rica Achieved the Elusive Double Incorporation (Palgrave Macmillan) and The Quest for Universal Social Policy in the South: Actors, Ideas and Architectures (Cambridge University Press).