Prof. Jung is born in 1963 and graduated from Seoul National University in 1988. He is working for Asan Medical Center, University of Ulsan since 1997 as a Gastroenterologist. His main interests are esophageal motility, Helicobacter and endoscopic intervention. He is currently active member of AGA (AGAF) and ASGE (FASGE), too. He has numerous publications at SCI medical journals. Another special interest is medical volunteering as a teacher on the knowledge and skills of endoscopy and GI fields. His medical volunteering is for Cambodian doctors since 2017.