Dr. Han is the Director of the Hepatology Clinical Research Center and Assistant Director of the UCLA Asian Liver Center. His research interests have focused on the treatment of chronic viral hepatitis B and C, the prevention of recurrent viral hepatitis after liver transplantation, and the prevention and treatment of hepatocellular carcinoma. He is the Principal Investigator of the National Institute of Health (NIH) Hepatitis B Clinical Research Network in Los Angeles and multiple clinical studies involving treatment of chronic hepatitis B and C. Dr. Han also serves on the editorial boards of Gastroenterology, Hepatology, and Clinical Gastroenterology and Hepatology and is a Guest Associate Editor for Gastroenterology and Digestive Diseases and Science. He has published many articles in the area of viral hepatitis, liver transplantation, and liver cancer and is an active speaker, lecturing on these subjects both nationally and internationally. He has been recognized by Best Doctors every year since 2003. He is a past president of the Southern California Society of Gastroenterology and an ongoing council member.