Dr. Jeong Won Jang is an Associate Professor of Internal Medicine at The Catholic University of Korea. He received his medical degree from The Catholic University of Korea, and completed his Internal Medicine Residency and Hepatology/Gastroenterology Fellowship at Seoul St. Mary’s Hospital in Seoul, Korea. After serving as a faculty member in the Center for Hepatobiliary Diseases at Incheon St. Mary’s Hospital between September 2005 and February 2013, he moved back to Seoul St. Mary’s Hospital in March 2013, where he currently serves as a faculty member in the Liver Unit, Gastroenterology, Department of Internal Medicine at Seoul St. Mary’s Hospital, Seoul, Korea. His current clinical activities include attending the Gastroenterology service at Seoul St. Mary’s Hospital and caring for patients with liver diseases at a Liver unit. Dr. Jang has authored and co-authored over 100 articles and one book. He received a Young Investigator Award from Department of Internal Medicine, The Catholic University of Korea in 2007. Dr. Jang's clinical expertise includes viral hepatitis and liver cancer. His areas of research interest include (1) the reactivation and immunology of hepatitis B, (2) mutation and carcinogenesis of hepatitis B virus, and (3) inflammatory process in hepatocarcinogenesis. He is currently a board member of the Korean Association for the Study of Liver Diseases and The Korean Liver Cancer Study Group.