1976, BSc in Industrial and Labour Relations, Cornell University; 1978, MA in Economics, Princeton University; 1981, PhD in Economics and Demography, Princeton University. Formerly: Assistant Professor of Economics, Carnegie-Mellon; Assistant and Associate Professor of Economics, Harvard; Professor and Chairman of Economics, Columbia. Chairman, Dept of Global Health & Population, HSPH. Currently: Fellow, American Academy of Arts and Sciences. Faculty Research Associate, Labour Studies, Ageing, and Health Economics programmes, National Bureau of Economic Research. Research Fellow, IZA; Director, Harvard Program on Global Demography of Aging. Member, Board of Trustees: amFAR; PSI; JSI. Co-Editor, Journal of the Economics of Population Ageing.