Passed Public Officer Qualification Exam in 1952 (former Civil Service Examination)
Passed Judicial Officer Qualification Exam in 1953 (former Judicial Examination)
Judicial Officer, Ministry of Government Legislation
Director of Higher Education, Director of Textbook Editing, etc., Ministry of Culture and Education
Chief Executive, National Library of Korea
Planning & Management Director, Ministry of Culture and Education
Chief Executive, National Education Training Institute
Vice Minister, Ministry of Culture and Education
President, Korean Environmental Law Association (Currently Honorary Chairman)
Committee Member for Judicial Examination, Committee Member for Civil Service Examination
Current Private Practice (Seoul Bar Association)
Visiting Professor, College of Law, Korea University
Mediator, Central Environmental Dispute Resolution Commission
Foreign Legal Counsel Committee Chair, Korean Bar Association
Director of Legislation, Seoul Bar Association
Executive Director & Director of Legislation, Korean Bar Association
Director and Councillor of Korea, LAWASIA
Director, Inter-Pacific Bar Association
Member, Regulatory Reform Committee
President, Legal Training Institute of Korean Bar Association
President, Inter-Pacific Bar Association
Senior Partner, Rhi & Partners
Of Counsel, K1 Chamber