- Public Security Division General Director, Anyang Police Station, Gyeong Gi Provincial Police Agency
- Gang nam Police station, Legal Counsel
- Member of Regulatory Reform Committee of Korea National Police Agency
- Member of legal counsel for arbitration of Yongsan Police Station.
- Special Investigation for Independent Counsel (Inducement of Strike of Korea Minting, Security Printing & ID Card Operating Corp.)
- Legal Advisor of Korea SMEs and Startups Agency
- Members of preparing the Korean Bar examination
- Representative, Neulpuren Oscar vill corp.
- VP, Woolim holding corp.
- Representative, Baruntur corp.
- Legal Council for Seoul Provincial Police Agency
- Legal Council of demonstrations and protests, Seoul Provincial Police Agency
- Public Commission Member, National Labor Relations Commission, Gyeonggi District Branch
- Disadvantaged Change of Rules of Employment. (M.A, 1994)
- Due Process of Arbitration of Labor dispute (Legal Research of Labor law, 1997)
- Unilateral Binding Power of Labor Collective Agreement (1998)
- Restriction of dismissal for business judgement (Critics of Labor Precedents, 1997)
- Comparison of Labor Relation between Labor Collective Agreement Period and End of period (1999)
- Compliance of Labor Collective Agreement (Legal Research of Labor Law, 1999)
- Citizens and Attorney (Seoul Bar Association)