2003 Mar. - 2007 Feb.: Residency, Department of Surgery, Seoul St. Mary's Hospital, Catholic University of Korea 2012 Mar. - 2017 Feb: Clinical Assistant Professor in Department of Surgery, Uijeongbu St. Mary's Hospital 2017 Dec. - 2019 Feb.: University of Texas, Health Science Center at Houston 2017 Mar. - 2021 Feb.: Clinical Associate Professor in Department of Surgery, Uijeongbu St. Mary's Hospital 2021. Mar. - present: Assistant Professor in Department of Surgery, Uijeongbu St. Mary's Hospital 2022 - Present: Korean Hernia Society, Director of the Training committee 2023 - Present: Korean Surgical Skill Study Group, Scientific Committee 2023 - Present: The Korean Society of Coloproctology, Vice Secretaries General