Professor Leo Yee Sin served as the Executive Director of Singapore's National Centre for Infectious Diseases (NCID) from 2017 to 2023. During her tenure, she established NCID as an innovative institution integrating clinical care, public health, research, training, and community outreach. She led teams through multiple outbreaks in Singapore from 1999 to 2022, published over 400 peer-reviewed scientific papers and received numerous national awards. A recognised authority in her field, she serves as a member in numerous committees and advisory boards including multiple World Health Organisation workgroups. She has received prestigious accolades and now contributes her expertise as Senior Consultant at the Director-General Health's Office in Ministry of Health, Singapore and Senior Advisor at the National Centre for Infectious Diseases and the National Healthcare Group.