He is also a member of the doctoral faculty at the CUNY Graduate Center in Manhattan, a faculty associate of the CUNY Institute for Demography Research (CIDR), and a research associate in health economics at the National Bureau of Economic Research. He has been a visiting professor at UC Berkeley and Harvard University, a member of an Institute of Medicine committee on veterans, a member of a National Research Council panel on immigration, and a staff economist with the U.S. Council of Economic Advisers.