Jason Lee is an Associate Professor at the Yong Loo Lin School of Medicine, National University of Singapore. He directs the Heat Resilience and Performance Centre and co-leads the Human Potential Translational Research Programme. He studies the physiological demands associated with passive and exertional heat stress and how humans adapt to ensure optimum performance and survival. Jason co-chairs the Heat Injury Clinical Practice Guidelines at the Ministry of Health, Singapore and was the past chair for the Scientific Committee on Thermal Factors at the International Commission on Occupational Health (2018 to 2024). He is on the management committee at the WHO-WMO Global Heat Health Information Network (GHHIN) and leads the GHHIN Southeast Asia Hub to scale up efforts in managing the complex health risks posed by rising ambient temperatures. Jason is a member of the Expert Advisory Group at the Rockefeller Foundation.