- Seoul National University Hospital Intern
- Seoul National University Hospital Internal Medicine Resident
- Clinical instructor, Department of Hematology and Oncology, Seoul National University Hospital
- Hematology/Oncology Specialist at National Cancer Center Hospital
- Associate Professor, Catholic Kwandong University International St. Mary's Hospital
- Regular member of the Korean Clinical Oncology Society
- Regular member of the Korean Society of Internal Medicine
- Regular member of the Korean Cancer Society
- Regular member of the Korean Anticancer Therapy Association
- Full member of American Society of Medical Oncology (ASCO)
