Dr. Youchun Wang is now professor and executive director of Institute of Medical Biology, Chinese Academy of Medical Science & Peking Union Medical College, Kunming, China. He used to be chief expert on quality control of vaccines and deputy director of the National Institutes for Food and Drug Controls (NIFDC), co-director of WHO Collaborating Center for Standardization and Evaluation of Biologicals, and director of NMPA Key Laboratory for Quality Research and Evaluation of Biological Products. He got his Medical Degree (MD) on Epidemiology from Peking Medical University and PhD on Virology from University College London (UCL). He has mainly done research works on hepatitis virus, HIV, HPV, and emerging viruses such as Ebola virus, SARS-CoV-2, and others. He now focuses on pseudotyped viruses for different viruses, especially for emerging viruses, and has also developed new methods for quality control of viral vaccines and diagnostics. He obtained several grants from WellcomeTrust in UK, Ministry of Science and Technology, National Foundation of Natural Science, and others in China. He has published more than 320 academic papers, 150 of which were published in Cell, Nature, Science, Cell Host & Microbe, and other SCI journals as the first or corresponding author. His book was also published by Springer Nature before. He has held several positions in academic associations, such as former Chairman of Medical Virology and Vice Chairman of Medical Microbiology and Immunology of Chinese Medical Association, former Vice Chairman of Chinese Laboratory Animal Association, former Chairman of Beijing Medical Virology, and Chairman of the vaccine committee of Chinese Pharmacopoeia.