| 1. | Workshop on Productivity and Macroeconomics, Gakushuin University, January 2011. (Invited) |
| 2. | 12th Macroeconomics Conference, Tokyo, Hitotsubashi University, December, 2010. (Discussion) |
| 3. | 4th KIC International Conference, November 2010. (Invited) |
| 4. | NBER Economic Growth Conference, Federal Reserve Bank of San Francisco, February 2009. (Invited) |
| 5. | 4th Annual Conference on Economic Growth and Development, Indian Statistical Institute, New Delhi, December 2008. |
| 6. | Minnesota Workshop in Macroeconomic Theory, Minneapolis, July 2008. |
| 7. | Korean Econometric Society Macroeconomics Meeting, Seoul (Korea), June 2008 (Invited Plenary Talk). |
| 8. | Society for Economic Dynamics (SED) Annual Meeting, Prague (Czech), June 2007 (Invited). |
| 9. | Society for Advancement of Economic Theory (SAET), Kos (Greece), June 2007 (Invited). |
| 10. | American Economic Association Annual Meeting (KAEA Session), Chicago, January 2007. |
| 1. | 2009-2010: Yonsei University, Boston University, GRIPS, University of Tokyo, Keio University, Hitotsubashi University, Kyung Hee University, Osaka University. |
| 2. | 2008-2009: Board of Governors, Michigan State University, National Graduate Institute of Policy Studies. |
| 3. | 2007-2008: Federal Reserve Bank of Minneapolis, Korea University, Seoul National University |
| 4. | 2006-2007: Yale, NYU, World Bank, Federal Reserve Board of Governors, Duke, University of Chicago, Federal Reserve Bank of Richmond, UC Berkley, Federal Reserve Bank of San Francisco, Vanderbilt, UC Santa Barbara. |