Jonathan Grigg is the leading UK paediatrician in the effects of air pollution. He is a British professor of paediatric respiratory and environmental medicine at Queen Mary University of London. He is a former Research lead of the British Paediatric Respiratory Society and was a Vice Chair of the Royal College of Physicians' working party on air pollution and authored the report "Every breath we take, the lifelong impact of air pollution". He is the Deputy Director of the North Thames CLAHRC.