Majid Ezzati (http://www.globalenvhealth.org) is Professor of Global Environmental Health at Imperial College London, Director of Wellcome Trust-Imperial Centre for Global Health Research, and Director of the WHO Collaborating Centre on NCD Surveillance and Epidemiology. His research focuses on exposure to and health effects of environmental, behavioural, nutritional, and metabolic risk factors and their interventions, and on health inequalities. 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 (www.ncdrisc.org) and co-leads NCD Countdown 2030 (www.ncdcountdown.org), worldwide scientific collaborations that aim to strengthen the evidence for more effective NCD prevention and management. He is a fellow of the UK Academy of Medical Sciences.