Dr. Zheng Zeng is a Professor (Chief Physician) at Peking University First Hospital (PUFH). He has been serving PUFH since June 1992. He focuses on clinical and basic research on hepatology, autoinflammatory diseases, population genetics and virology. Previously, Dr. Zeng was a Visiting Fellow at the Laboratory of Genomic Diversity in the National Cancer Institute (NCI), National Institutes of Health (NIH), USA from 2001-2003. He also treated patients who suffered from gastrointestinal diseases and hepatitis and studied on several clinical trials for chronic hepatitis B and C in New York, USA from 2012-2015. He has been a Clinical and Research Specialist of Infectious Diseases and hepatology almost 30 years. Dr. Zeng is a professional expert for Infectious Diseases and hepatology. He is a member of Chinese Medical Association of Hepatology. Dr. Zeng set up an international hepatitis B study cohort with multiple centers in China. This cohort has recently been applied to replicate a recent study that associated eleven SNPs in the HLA DPA1 and HLA-DPB1 gene regions. He is recently mounting a GWAS analysis with SNPs DNA-chips and exome sequencing with 2000 patients in hepatitis B study. He and his colleagues provided the first strong replication cohort of these important associations with Hepatitis B persistence in Chinese and other Asian populations. He developed HBV P, BCP, PreC and HCV sequencing. And DNA sequencing for Gilbert syndrome, Crigler-Najar syndrome, autoimmune lymphoproliferative syndrome, autoinflammatory syndrome, coach syndrome, joubert syndrome, hemochromatosis and Wilson’s disease. He also developed a medical expert diagnosis and treatment system.