1987~2019 Professor, Seoul National University Hospital
2019.9~ Professor-emeritus, SNUH
2011~2012 President, KSUM
2012~2014 President, AFSUMB
2015~2018 President, Korean Society of Radiology
2019~2021 President, WFUMB
2019~ Director, K-Radiology Clinic (www.k-radiology.com)
2019~ Director, Research Institute of NCS
2020~ Consultant professor, Ewha Womens University Mokdong Hospital