Doctor Emmanuel Stamatakis is Associate Professor of Exercise, Health and Physical Activity Sport Sciences in the Faculty of Health Sciences and the Charles Perkins Centre at the University of Sydney. His research interests include the cardiometabolic consequences of inactivity and sitting, the direct and substitution effects of time-dependent behaviours (e.g. sleep, sitting, physical activity), interactions of physical activity with other health behaviours (e.g. alcohol intake and sleep); the socio-economic determinants of physical activity and sedentary behaviour. Visit http://sydney.edu.au/health-sciences/about/people/profiles/emmanuel.stamatakis.php