| 1964.03-1967.09 | Subsection Chief, Position Classification Section, Ministry of Government Administration |
| 1972- | Member, Korean Commercial Law Association |
| 1975-1984 | Leader, Law and Society Group of Korea |
| 1975-2007 | Researcher, Korea Management and Development Institute |
| 1977-2007 | Korea-Germany Law Academy |
| 1978-2003 | Arbitrator, The Korean Commercial Arbitration Board |
| 1979.06-2003.03 | Member of the Advisory Committee to the Korean Supreme Court regularly to deliberate on the Basic Procedural Codes and the Court Rules, court process, case management, enforcement system |
| 1981.02-1982.08 | Policy Advisor to the Ministry of Finance on Tax System |
| 1981.07-2004.12 | Member of the Advisory Committee to the Minister of Justice regularly to deliberate on the Basic Codes amendments, North Korean refugees, independence of the prosecution authority |
| 1981.12-1984.12 | Member, Special Committee on Revision of Civil and Commercial Codes |
| 1982-1988 | Member of the Board of Directors, Korea Maritime Transportation Academy |
| 1983.04-1989.04 | Conciliator, Non-life Insurance Dispute Mediation and Conciliation Committee, Ministry of Finance |
| 1983.08-1992.08 | Vice President, Korea maritime Law Association, Inc |
| 1984.03-1989.06 | Policy Advisor to the Ministry of Legislation |
| 1984.04-1989.04 | Member, Special Committee on Revision of Civil Procedure |
| 1984.05-1993.05 | Member of the Board of Directors, Korea Literary and Academic Copyrights Association, Inc. |
| 1985.11-1989.11 | Member, Special Committee on Revision of the Commercial Code (Chapters on Insurance and Admiralty) |
| 1986.01-1996.12 | President, Korean Intellectual Property Research Society, Inc. |
| 1986.01-2007.02 | Member, Technology, Management and Economics Academy |
| 1987.07-1993.06 | Conciliator, The Copyright Dispute Conciliation and Deliberation Committee, Ministry of Culture and Sports |
| 1987.12-1993.02 | Conciliator, The Computer Program Dispute Conciliation and Deliberation Committee, Ministry of Science and Technology |
| 1988.05-1994.04 | Member of the Board of Directors, the Korea Stock Exchange |
| 1988.06- | Policy Advisor to the Korea Intellectual Property Office |
| 1988.08-1990.12 | Chairman, Drafting Committee on Protection of Lay-out Designs of Integrated Circuits. |
| 1989.04-2006.09 | Member of the Board of Directors, Esquire Cultural Foundation, Inc. |
| 1989.08-1993.02 | Member of the Advisory Committee on Clean Government to the Prime Minister |
| 1990.07-1999.05 | Member of the Board of Directors, Korea Legislation Research Institute |
| 1990.09-2004.12 | President, The Private Law Cases Research Society |
| 1990.09-1993.02 | Member, Consultative Committee on Information and Telecommunications |
| 1990.11-1994.11 | President, The Korean International Trade Law Association |
| 1991.10- | Internal Auditor, The Korea-U.S. Educational and Cultural (Fulbright) Foundation |
| 1991.11-1994.11 | Member of the Board of the Directors, Maritime Industry Research Institute |
| 1992-2003 | Chairman, Junghae Welfare Society, Inc. |
| 1992.02.23 | Member, the Seoul Hankang Rotary Club and Paul Harris Fellow |
| 1992.04-1996.03 | President, Korea University Golf Federation |
| 1992.06-1995.06 | Member of the Legal Affairs of Commercial Arbitration, Korean Commercial Arbitration Board |
| 1992.11-1994.11 | Advisor to Hanbit Intellectual Property Management Foundation, Inc. |
| 1992.12-1994.12 | President, Korea Cornell Alumnae Association |
| 1993.06-1996.03 | President, Korea Golf Academy |
| 1993.06-1999.06 | Conciliator, The Korea Consumer Protection Board |
| 1993.11-1994.02 | Chairman, Third Committee, Judicial System Development Committee of The Supreme Court |
| 1993.11-1994.11 | Vice President, UNICEF Lawyers’ Club |
| 1994.02-1996.01 | Board Member, Korea Golf Association |
| 1994.02-1996.02 | Chairman, The Semiconductor Layout Design Dispute Conciliation and Deliberation Committee, Ministry of Industry and Energy |
| 1994.04-2003.04 | Conciliator, The Seoul District Court |
| 1994.12.30- | Board Member, Song Jinwwo Memorial Fund, Inc. |
| 1995.07-2001.06 | Board Member, Patented Technology Information Center, Korea Invention Promotion Association |
| 1996.03-1996.05 | Member, The Judicial Research and Training Institute Development Committee |
| 1996.07 | Examiner, The National Patent Attorney Examination |
| 1996.03-2002.03 | Outside Director, Dacom, Inc. |
| 1996.06-1998.02 | Chairman, Legal Education committee of the Ministry of Education |
| 1996.11-1999.02 | Examiner, The National Judicial Service Examination |
| 1997.01-1999.01 | Chairman, The Advisory Committee to the Korean Intellectual Property Office |
| 1998.01-2000.01 | Chairman, Law Revision Committee on Corporate Reorganization and Bankruptcy Code |
| 1998.02-2000.01 | Member, The Scholarship Advancement Committee, Ministry of Education |
| 1998.02-1999.03 | Member, Special Committee on Revision of the Commercial Code (Corporation law) |
| 1998.04-2012.03 | Vice President, The UNICEF Korea |
| 1998.07 | Examiner, The National Legislative Examination |
| 1998.07-2006.07 | Private Sector Advisor to Intellectual Property and Trade Negotiations Affairs, Ministry of Foreign Affairs |
| 1998.10-1998.12 | Chairman, the Organizing Committee on the 1st Korea Legal Scholars Convention on the Occasion of the 50th Anniversary of the Government Foundation |
| 1999.01.27-2013.04.18 | Member, Board of Trustees, Daewoo Education Foundation (Ajou University), Korea |
| 1999.03-2009.12 | President, The Korea Childhood Leukemia Foundation |
| 1999.03-2001.03 | Member, Social Science Committee, UNESCO/Korea |
| 1999.03-2010.03 | Member, Board of Directors, The Hana Bank Korea |
| 1999.05-2003.03 | Member, Board of Directors, International Union for Conservation of Nature (IUCN), Korea |
| 1999.05-2005.12 | President, The Korean Law Professors Association, Inc. |
| 1999.05-2005.12 | Vice President, Korea Legal Center, Inc. |
| 1999.06- | Member, Korea Arbitrators Association |
| 1999.09-2001.09 | Member, Special Committee on Revision of Civil Procedure and Civil Code |
| 1999.12- | Member, Board of Trustees, Korea Family Legal Service Center, Inc. |
| 2000.01-2016.08.14 | Member, Board of Directors, The Beautiful Foundation |
| 2000.03-2002.02 | Member, Lawyer Disciplinary Committee, Korea Bar Association |
| 2000.03-2005.06 | Member, Advisory Committee on Research and Development, Asan Social Welfare Foundation, Inc. |
| 2000.03-2000.07 | Member, Special Committee on Enactment of the National Judicial Examination Law |
| 2000.04-2010.03 | Chairman, Audit Committee, Hana Bank |
| 2000.05-2002.04 | Member, the 21st Century Lawyers Committee, Korea Bar Association |
| 2000.05- | Advisor to the Seoul National University Law School Alumnae Association |
| 2001.02-2017.02 | Member of the Board of Directors, Hanbit Cultural Foundation, Inc. |
| 2001.04-2003.02 | President, Korea Digital Property Law Association |
| 2001.04-2003.03 | Lawyer Member, Korea Chapter of the Amnesty International |
| 2001.04-2003.03 | Board Member, Children’s Hospital Supporters Association, Seoul National University |
| 2001.07-2003.12 | Vice Chairman, The National Judicial Examination Management Committee, Ministry of Justice |
| 2001.07-2005.04 | Prime Minister’s Commission on Youth Protection |
| 2001.07-2008.09 | President, The Korean e-commerce Dispute Conciliation Committee, Ministry of Industry and Resources |
| 2002.01-2003.12 | Advisor to the Korea-Canada Academy |
| 2002.02-2003.07 | Member, The Prosecution Human Resources Management Committee, Ministry of Justice |
| 2002-2003 | Member, The Korea-New Zealand Business Council |
| 2002.12-2003.03 | Member, Board of Directors, The National Coalition of Religious Peace Corps (NCRPC) |
| 2003.01-2004.01 | President, The Fulbright Fellows Association in Korea |
| 2003.07-2005.06 | Member, The National Unification Advisory Council |
| 2003.07-2007.06 | Member, Cornell University Council |
| 2003.10- | Member, Seoul International Forum |
| 2003.11-2005.11 | Member, Board of Directors, Korea Medical Education Evaluation Institute |
| 2004.03-2005.03 | Member, Advisory Committee to the National Intelligence Service on Industrial Security |
| 2004.05- | Advisor to the Legal Times |
| 2005.01-2006.12 | Presidential Commission on Judicial Reform |
| 2005.12-2007.06 | Chairman, Korea Trade Commission |
| 2007.05-2017.05 | President, Board of Management, The Judicial Research and Training Institute |
| 2008.05-2013.08 | Presidential Committee for the 60th Anniversary of The Republic of Korea |
| 2010-2015 | Chairman, Advisory Committee on Recommendation of Supreme Court Justices |
| 2012.03- | President, Korean Committee for UNICEF |
| 2015.04-2019.04 | Chairman, Policy Advisory Committee for National Human Rights Commission |
| 2015.09-2016.08 | Distinguished Visiting Professor, Hanyang University |
| 2016.06- | Member, Sages Group for North Korean Human Rights |
| 2017.11- | Member of the Board Directors, The International Human Rights League of Korea |