-(사)한국사회서비스정책연구원 대표 -경기도, 충청남도 행정심판위원회 심판위원, -사법시험, 행정고시, 입법고시, 공인노무사, 관세사, 감평사 등 각종 국가시험출제위원 -서울, 경기도지방노동위원회 공익위원 -국회 입법자문위원, 경기도 공직자윤리위원 -한국 공법학회, 행정판례연구회, 경희법학 편집위원 -(사)한국사회서비스정책학회 회장 -Visiting Professor, Syracuse University, SCHOOL OF LAW, NY -Fulbright senior scholar, UNIVERSITY OF WASHINGTON, SCHOOL OF LAW, Seattle, WA. -Visiting Professor, INDIANA UNIVERSITY, SCHOOL OF LAW, BLOOMINGTON, IN, USA - Senior Research Fellow, Dept. of Int'l Trade & Coopration Chinnam Privincial Government. -Senior Research Fellow, Korea Consumer Protection Board, Korea. -Visiting Professor, Columbia University School of Law.(U.S.A.) -Research Fellow, Harvard Law School, (U.S.A.)

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ADMINISTEATIVE LAW, ENVIRONMENTAL LAW , EMPLOYMENT LAW, Social welfare law

ADMINISTEATIVE, ENVIRONMENTAL LAW, EMPLOYMENT LAW