Sebastien Chastin is a Professor of Health Behavior Dynamics in the School of Health and Life Sciences at Glasgow Caledonian University and in the Department of Movement and Sports Sciences at Ghent University. He received BSc in metrology and applied physics, Master in Applied Physics a Master in Rehabilitation Sciences and a PhD in Non-linear physics. He is a fellow of the Royal Statistical Society. Previously he had post at the British Antarctic Survey, Oxford and Edinburgh University. His research focusses on dynamics of health behaviour in relation to ageing, places and systems. Understanding why, when and how people decide to move or not, is crucial to promoting healthy movement behaviour and ageing. He develops statistical and analytical techniques to extract information from body worn sensor such as accelerometers that enable to understand how humans accumulate physical activity, sedentary time and sleep and how this changes over time. Currently Sebastien has as a large portfolio of projects on the determinants of movement behaviour in older adults and clinical populations.