Education:

Feb. 1984	Medical degree, Yonsei University, College of Medicine, Seoul, Korea
Feb. 1996	Doctor of Philosophy, Graduate School, Yonsei University, Seoul, Korea

Appointments:

Mar. 1989 - Feb. 2004	Assistant professor, Associate professor, and Professor in the Department of Internal Medicine, Wonju Christian Hospital, Yonsei University
Jan. 1996 - Dec. 1997	Senior research fellow, Department of Gastroenterology, University of Washington, USA
Mar. 2004 - Feb. 2024	Professor in Department of Internal Medicine, Gangnam Severance Hospital, Yonsei University
Mar. 2011 - Feb. 2015	Director of Cancer Hospital, Gangnam Severance Hospital, Yonsei University.
Mar. 2024 - Present.	Professor in the Department of Internal Medicine, Yonsei University Wonju College of Medicine, Wonju Severance Christian Hospital.

Professional Activities:

Director of the Scientific Committee, Korean Society of Gastrointestinal Endoscopy
(Nov. 2001-Nov. 2003, Nov. 2005-Nov. 2007, Nov. 2009-Nov. 2011)
International Editorial Board, Gastrointestinal Endoscopy (Jan. 2005-Present)
Director of the General Business Board, Korean Society of Internal Medicine (Oct. 2013-Oct. 2016)
President of Society of Gastrointestinal Intervention (SGI) (Oct. 2016-Oct. 2018)
President of Korean Stent Research Society (Nov. 2016-Nov. 2018)
President of Korean Society of Gastroenterology (Nov. 2017-Nov. 2019)