President of Labor Lawyers Association, Korean Bar Association (2021)

Chairman, Legislation Committee of the Seoul Bar Association (2021)

Member, Dispute Mediation Committee, Federation of Korean Trade Unions (2019-Present)

Kim & Chang (2014.11.-Present)

Advisory Lawyer, Incheon Metropolitan City (2014-2018)

Chairman, Labor Law Training Institute, Seoul Bar Association (2014-Present)

Consultant, Ministry of Security and Public Administration (2014-2015)

Visiting Professor, College of Law, Gachon University (2014-Present)

Adjunct Professor, Korea University Law School (2014-Present)

Co-President, Society of Labor Law Theory and Profession (2014-2018)

Public Interests Member, National Labor Relations Commission (2011-Present)

Legal Advisor, National Economic Advisory Council (2010-2012)

Member, Complication Management Appeal Committee, Ministry of Labor (2009-2011)

Member, “Labor, Complaint & Administration Ombudsman” Committee, Ministry of Labor (2009-2011)

Chairman, Labor Community, Seoul Bar Association (2009-Present)

Advisor, Korea Baseball Organization (2009-Present)

Lee & Ko (2008.10.-2014.9.)

Member, Certified Labor Consultant Disciplinary Committee, Ministry of Labor (2008-Present)

Lecturer, Graduate School of Business Administration, Yonsei University (2008-2015)

Legal Advisor, Ministry of Land, Transport and Maritime Affairs (2006-2008)

Legal Advisor, Korean Taxi Workers’ Unions (2006-Present)

Legal Advisor, Korean National Electrical Workers Unions (2006-Present)

Member, Private and Public Joint Commission (2006)

Member, Appeal Committee of Counseling Office ’or Equal Employment, Ministry of Labor (2005-2014)

Legal Advisor, Federation of Korean Trade Unions (2005-Present)

Part Time Professor, Kyungwon University (2004-Present)

Jisung Law Offices (2004-2008)

Commissioner, Industry Accident Compensation Insurance Appeal Committee, Ministry of Labor (2003-2006)

Outside Professor (Labor Law), Judicial Research and Training Institute (2002-Present)

Question Designer of Judicial Examination (2001-2006)

Member, Regulatory Appeal Committee, Ministry of Labor (2000-2016)

Legal Advisor, Korean Automobile & Transport Worker’s Federation (2000-Present)

Visiting Professor, Employment & Labor Training Institute (2000-2004)

Legal Advisor, Ministry of Education (2000-2002)

Public Interests Member, National Labor Relations Commission (1997-2006)

Advisory Member, Korea Employers Federation (1996-Present)

Commissioner, Employment Insurance Appeal Committee, Ministry of Labor (1996- 2002)

Advisory Lawyer, Ministry of Employment and Labor (1996-Present)

Commissioner, Presidential Commission on Industrial Relations Reform (1995-1997)

Hoemyung Joint Law Office (1995-2000)

Legal Advisor, Youone Engineering & Construction Co., Ltd. (1993-1995)

Lecturer, Special Graduate School of Law, Yonsei University (1991-2000)

Lecturer, College of Law, Kyonggi University (1991-1996)

Legal Advisor, Daewoo Group (1989-1993)

Judge Advocate Officer, Republic of Korea Army (1986-1989)