Stewart Trost is a Professor of Physical Activity and Health, in the School of Exercise and Nutrition Sciences and Institute of Health and Biomedical Innovation, at Queensland University of Technology, Australia. Trost’s research interests include measurement of physical activity and sedentary behaviour, psychosocial and environmental correlates of physical activity behaviour, and community-based interventions to promote physical activity and prevent obesity in children and youth. He has served as a consultant on matters related to measurement of physical activity to many domestic and international research groups and public health organizations including the Australian Federal Government, the U.S. National Institutes of Health, US Centers for Disease Control, and the Robert Wood Johnson Foundation. Trost headed the scientific committee responsible for drafting the first children’s physical activity recommendations for Australian youth, was a member of the scientific committee for drafting physical activity and screen time recommendations for Australian children under five, and was a member of the CDC panel to establish evidence-based guidelines for physical activity in school aged youth in the United States. In 2012, he served on the USA President’s Council on Fitness, Sports, and Nutrition Science Board. To date, Trost has 140 publications in peer-reviewed research journals, 15 book chapters, and 6 government or agency reports.