Feb. 1984 Medical degree, Yonsei University, College of Medicine, Seoul, Korea
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 Department of Gastroenterology, Wonju Severance Hospital, Yonsei University
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)