At GRIPS, he teaches economics to masters and Ph.D students, who are government officials coming to study in Japan from throughout Asia and Africa. He earned a Ph.D in Economics from Princeton University under the guidance of Professors Alan Blinder and Harvey Rosen. As an undergraduate student at the University of Iowa, he studied economics, political science, and history. He completed internships at the U.S. Social Security Administration, the White House, and the U.S. Senate. His main research interests are related to Social Security, pensions, and the economics of aging. Particularly, he is working to develop methods to better analyze the future outcomes of defined contribution pension programs. He published a number of articles, papers, and book chapters in National Tax Journal, Korean Economic Review, among others.