Sonja Kahlmeier is an independent expert on physical activity, sustainable transport and healthy cities, consulting amongst others for the WHO Regional Office for Europe. Before, she headed the Health Department at FFHS with teaching programs on nutrition, health promotion and osteopathy. She also led the health research, focusing on the topic of physical activity and health, where she specialized in policies and strategies as well as transport-related and economic approaches. She is particularly interested in upstream determinants of health and environmental health promotion. Previously, Sonja worked for the World Health Organization and the Universities of Zurich and Basel. She holds a master's degree in environmental sciences from ETH Zurich, a doctorate in epidemiology from the University of Basel, a habilitation in public health from the University of Zurich and until 2024 a professorship at SUPSI.