Professor Julie Leask is a world-leading social scientist internationally recognised for her research on the social and behavioural factors that influence vaccination. She co-leads the Social and Behavioural Insights in Immunisation research group at the University of Sydney’s School of Public Health. Her expertise has contributed to the work of the World Health Organization, UNICEF, the International Federation of Red Cross and Red Crescent Societies, a US presidential committee, and public health agencies in the United States and Europe. She has also authored three comment articles in Nature. She was recognised in the Australian Financial Review’s 100 Women of Influence in 2019 and appointed an Officer of the Order of Australia in 2024.