Majid Ezzati is Professor of Global Environmental Health at Imperial College London. Majid and his research group have conducted field studies on air pollution in Kenya, Ghana, The Gambia, and China. He led the World Health Organization’s Comparative Risk Assessment Study, which was the first consistent global analysis of behavioural, environmental, nutritional, psychosocial, and metabolic risk factors and formed the scientific core of World Health Report 2002: Reducing Risks, Promoting Healthy Life. Majid leads the NCD Risk Factor Collaboration and co-leads NCD Countdown 2030, worldwide scientific collaborations that aim to strengthen the evidence for more effective NCD prevention and management. He also leads Pathways to Equitable Healthy Cities, a global partnership that aims to improve population health, enhance health equity and ensure environmental sustainability in cities around the world through co-production of rigorous evidence with policy and civil society partners in cities in six countries. He is a fellow of the UK Academy of Medical Sciences.