Professor in the Otorhinolaryngology Department of ORL-HNS, Severance Hospital. He is specialized in Head and Neck Surgery. He received his medical degree at the Yonsei University College of Medicine, Seoul, Korea. His research interests are Head and Neck Surgery, Otorhinolaryngology, Thyroid Cancer, Endoscopy, Robotic Surgery, Parathyroid Diseases, Parathyroidectomy, Parathyroid Glands, Thyroid Gland, Hyperparathyroidism, Primary Hyperparathyroidism, Parathyroid Neoplasms.