- Seoul National University Hospital Intern
- Seoul National University Hospital Resident
- Instructor, Department of Nuclear Medicine, Yonsei University College of Medicine
- Clinical Research Assistant Professor, Department of Nuclear Medicine, Yonsei University College of Medicine
- Department of Nuclear Medicine, Catholic Kwandong University International St. Mary's Hospital
- Associate Professor, Catholic Kwandong University International St. Mary's Hospital
- Member of Korean Lung Cancer Society
- Member of the Korean Society of Nuclear Medicine
- Member of the Korean Thyroid Society
- Editorial member of Nuclear Medicine and Molecular Imaging (Journal of the Korean Society of Nuclear Medicine)
- Full member of the European Association for Nuclear Medicine (EANM)
- Regular member of the American Society of Nuclear Medicine (SNMMI)
