Ollie Jay is Professor of Heat and Health in the Faculty of Medicine and Health at the University of Sydney, and Director of the Heat and Health Research Incubator – a research centre dedicated to supporting multi-disciplinary research teams conduct projects that build resilience to a warming planet across the human lifespan. Specialising in understanding the physiological impacts of human heat stress, his influential work, with over 190 publications, informs the extreme heat policies of both public health and sports organisations on a global scale. In 2021, he co-led the first Lancet Series on Heat and Health.