- Kyunghee University Hospital Internal Medicine Resident
- Hallym University Sacred Heart Hospital Full-time lecturer, assistant professor, associate professor
- Therapeutic endoscopy training at Univ. of Tokyo Hospital (Prof. Mitsuhiro Fujishiro)
- Associate clinical professor, clinical professor, Gangdong Kyung Hee University Hospital
- Councilor of the Korean Society for Gastrointestinal Cancer Research
- Public Relations Director, Gyeongin Branch, Korean Society of Gastroenterology
- Member of the Gyeongin Branch of the Korean Society of Gastrointestinal Endoscopy
- Professor at Catholic Kwandong University International St. Mary's Hospital
