Dr. Nancy Leung is an Assistant Professor at the NUS Saw Swee Hock School of Public Health. She was formerly at the WHO Collaborating Centre for Infectious Disease Epidemiology and Control, School of Public Health, The University of Hong Kong. She conducts cross-disciplinary, international collaborative research on the epidemiology of influenza, SARS-CoV-2, and other respiratory viruses. As an infectious disease epidemiologist, Dr. Leung applies community-based epidemiological methods, including longitudinal observational cohorts, randomized vaccine trials and household transmission studies, to investigate individual and population immunity, vaccine responses, transmission and disease burden across Hong Kong and mainland China, with plans to expand this research to Singapore and other regions in Asia. Her research supports pandemic preparedness, disease surveillance and vaccination policy, including early evidence on coronavirus airborne transmission and facemask effectiveness during the COVID-19 pandemic. She has also contributed to global health policy through roles in WHO advisory groups on airborne transmission and indoor respiratory infection risk. She is an Editorial Board member for the International Journal of Epidemiology. As an ISRV Council member, Dr. Leung is passionate about shaping research agendas and policy recommendations for respiratory virus infections with better integration of epidemiologic research; and advocates for international collaboration especially supporting scientists and public health practitioners from low- and middle-income countries.