Dr. Do-Jin Hyun MD., RPSGT

Sleep Specialist (over 14 years)


  • Registered Polysomnographic Technologist
  • Medical College, Catholic University of Korea
  • Doctor’s degree, The Catholic University of Korea
  • Internship at St. Mary’s Hospital
  • Residency at Gangnam St. Mary’s Hospital
  • Associate Professor of Catholic University of Korea
Career/Institutional Appointment
  • Stanford University Hospital, USA
  • Heidelberg University Hospital, Germany
  • Sleep Specialist Course of AASM
Professional Organizations
  • American Academy of Sleep Medicine
  • European Academy of Sleep Medicine
  • International Surgical Sleep Society
  • American Association of Oral and Maxillofacial Surgeons
  • Korean Association of Oral and Maxillofacial Surgeons
  • Korean Society of Otorhinolaryngology-Head and Neck Surgery

Director Do-Jin Hyun, a sleep specialist medical doctor has completed an extensive training in the field of sleep medicine, focusing on sleep disorders and sleep-related conditions ranging from neurology, internal medicine, and psychiatry. Together in cooperation with Director Yong, the two started GNG Hospital dividing the hospital into plastic surgery and functionality disciplines.

Director Hyun and Director Seong of GNG Hospital strives to provide outstanding clinical care for all patients with a wide variety of functional issues, along with education for patients about the fundamentals of their disorders.

Our commitment to researching new therapies and methods ahead of its time, have made us one of the top trusted medical hubs in the field of plastic surgery and ENT in Korea