Professor David Dunstan is the head of the Baker-Deakin Department of Lifestyle and Diabetes within the Institute for Physical Activity and Nutrition. He also heads the Physical Activity laboratory at the Baker Heart and Diabetes Institute. His research focuses on understanding the adverse health consequences of too much sitting and the potential health benefits resulting from frequently breaking up sitting time with active countermeasures. In particular, he has developed effective strategies to reduce and break up sitting time in adults with or at risk of developing chronic diseases and to support office workers to reduce sedentary behaviour in workplace settings. He is also interested in how best to implement efficacious ‘sit less and move more’ interventions at scale within healthcare settings for those living with or at risk of chronic disease.