1985. Judge, Eastern Branch, Seoul District Court
1986. Judge, Jinju Branch, Masan District Court
1988. Judge, Seoul Criminal District Court
1990. Judge, the Seoul Civil District Court
1993. Director of Information System, National Court Administration , Judge, Seoul High Court
1997. Judge, Seoul District Court
1998. Presiding Judge, Daejeon District Court & Director of Judicial Policy, National Court Administration
1999. Presiding Judge, Suwon District Court
2000. Presiding Judge, Northern Branch, Seoul District Court
2003. Presiding Judge, Seoul Central District Court
2005. Presiding Judge, Busan High Court
2006. Presiding Judge, Seoul High Court
2011. Chief Presiding Judge, Seoul High Court
2011. Chief Judge, Daejeon District Court
2012. Chief Judge, Seoul Family Court
2013. Chief Judge, Seoul Central District Court
2013. The Chairman of the Board of Audit and Inspection of the Republic of Korea(~2017.12)
2018. Outside Director, NC Soft
2018. Managing Partner, CLASS