Executive Director of Korea Association for Clinical Oncology(KACO), 2010-Present Executive Director of Korea Cancer Association, 2014-Present Manager & Member, Subcommittee of Breast Cancer Review Board, Korea Cancer Chemotherapy Study Group, 2002-Present Lifelong Member, Korea Internal Medicine Association, 1997-Present Lifelong Member, Korea Cancer Association, 1997-Present, Academic Committee Member, Korea Cancer Association, 2010-Present General Affair Committee Member, Korean Cancer Society, 2010-Present Member, Korea Biochemistry & Molecular biology Association, 2000-Present Member, Gene Expression & Regulation Committee, Medical Center, Korea University, 2003-Present Member, Cancer Chemotherapy Committee, Guro Hospital, Korea University, 2004-Present Member, Clinical Research Committee, Guro Hospital, Korea University, 2002-Present Member, A Board of Examiner, Korea Cancer Research & Treatment Association, 2004-Present Member & Council of Korean Society of Cancer Prevention, 2006-Present