Dr Fiona Bull heads the Physical Activity Unit in the Department of Health Promotion at the World Health Organization (WHO) headquarters in Geneva, Switzerland. Prior to joining WHO in 2017 she was Professor of Public Health and Director of the Research Centre on Built Environment and Health at the University of Western Australia. Previous positions include Professor of Physical Activity and Director of the United Kingdom’s National Centre of Physical Activity and Health and Senior Scientist at the CDC in the Department of Health and Human Services, USA. Dr Bull was also President of the International Society of Physical Activity and Health from 2014 to 2016 and co-authored over 200 scientific publications. At WHO, Dr Bull leads a team working on promoting physical activity through active transport, sport and every-day activities through advancing the science, policy and practice to support countries implement WHO’s “Global Action Plan on Physical Activity 2018-2030: More active people for a healthier world”.