2011 March -present : Clinical Assistant Professor in Thyroid Cancer Center, Department of Surgery, Gangnam Severance Hospital, Yonsei University College of Medicine, 2009-2011; Fellowship in Endocrine and Thyroid Cancer Center of Gangnam Severance Hospital, Yonsei University Health System Seoul, Korea 2005-2009; Resident in General surgeon Gangnam Severance Hospital, Yonsei University Health System Seoul, Korea 2004-2005; Intern in Gangnam Severance Hospital, Yonsei University Health System Seoul, Korea Member of Korean Surgical Society Member of Korean Cancer Society Member of Korean Association of Thyroid and Endocrine Surgeons Member of Korean Thyroid Association Member of Korean Society of Endocrine and Laparoscopic Surgeons Member of International Association of Endocrine Surgeons