2014 .02 ~ 2016 .01 : Chairman, Department of Surgery, Korea University College of Medicine Seoul, Korea
2006 .09 ~ 2014 .01 : Professor & Chief, Colorectal Division, Department of Surgery, Korea University Hospital Seoul, Korea
2005 .04 ~ 2006 .08 : Professor & Director, Department of Surgery, DongGuk University Hospital Goyang, Korea
2001 .01 ~ 2005 .02 : Head, Laparoscopic Colon Surgery Unit, Hansol Hospital Seoul, Korea
1998 .03 ~ 2000 .12 : Associate Professor, Department of Surgery, Korea University College of Medicine Seoul, Korea
1995 .07 ~ 1997 .06 : Research Fellow, Department of Colorectal Surgery, Cleveland Clinic Foundation. Cleveland, Ohio
[국외]
~ : Visiting Professor of Surgery 2014~2023 School of Medicine, University of Western Sydney, NSW, Australia
~ : Yeoh Ghim Seng Professor of Surgery & Senior Consultant 2008~2014 Division of Colorectal Surgery, National University Hospital, Singapore
~ : Honorary Visiting Professor of Surgery (Dec 10-18, 2011) Royal Brisbane & Women’s Hospital, Brisbane, Queensland, Australia
~ : 2011 Dr. Anthony Yim Visiting Professor in Minimally Invasive Surgery and Innovative Technology Department of Surgery, Prince of Wales Hospital, The Chinese University of Hong Kong
~ : Honorary Visitng Academician Oct 2013 Academia of Medicine, Singapore
~ : Guest Professor of Surgery (April 6. 2012~March 31, 2013) Kumamoto University, Japan
~ : onorary Academic Visiting Professor (Feb 2013~Jan 2014) Macquarie University, Sydney, NSW, Australia
~ : Visiting Professor of Department Surgery (Feb 22, 2012 & May 23, 2015) National Cheng Kung University Hospital, Tainan, Taiwan
~ : Fellow, American College of Surgeons, Oct 2016
~ : Honorary Fellow, Hong Kong Society of Minimal Access Surgery, January 2013
~ : Honorary Fellow, The Association of Minimal Access Surgeons of India, May 2011
~ : Honorary Membership, Hong Kong Society of Robotic Surgery, February 2014
~ : Chairman, Korean Society of Endoscopic & Laparoscopic Surgery (KSELS), 2014-16
~ : Scientific Committee Chair, Korean Society of Endoscopic & Laparoscopic Surgery (KSELS), 2012-14
~ : Founding President, Korean Association of Robotic Surgeons (KAROS), 2013-15
~ : Vice President, Korean Cancer Society, 2013-16
[사회활동]
~ : ‘The William Hugh Isbister Lecture’: Deloyers procedure (retrograde right colon-rectum anastomosis) as an alternative to total colectomy: when and how The 2019 Saudi-International Colorectal Diseases Forum Mar 24-27, 2019. Riyadh, Saudi Arabia
~ : ‘Yasunobu Tsujinaka Memorial Oration’: Current Status of Robotic Colorectal Surgery The 27thAnnual Jagelman/37th Turnbull International Colorectal Symposium February 2-7, 2016. Boca Raton, Florida, USA
~ : ‘2015 BJS Society Lecture’: Minimally Invasive Complete Mesocolic Excision The 10th Anniversary Meeting of European Society of Coloproctology (ESCP) September 23-25, 2015. Dublin, Ireland
~ : 'Chennai Oration’: Has laparoscopic colorectal resection for cancer upstaged open resection? The 21st Annual Conference of the Indian Association of Surgical Gastroenterology Oct 13-16, 2011. Jaipur, India
~ : ‘Dr. Anthony Yim Visiting Professorial Lecture’: New frontiers of laparoscopic colorectal surgery. Prince of Wales Hospital. The Chinese University of Hong Kong. October 4, 2011. Hong Kong