Matthew Harris is a Clinical Senior Lecturer in Public Health Medicine, Honorary Consultant in Public Health Medicine, Director of Postgraduate Taught Courses in the School of Public Health, Imperial College London, and Theme Lead for Innovation and Evaluation in the NIHR Northwest London Applied Research Collaborative, UK. He has lived and worked in Brazil as a family doctor, in Ethiopia working for the WHO in immunization programmes, and in Mozambique as an HIV Technical Advisor, and served for two years as a Global Health Policy advisor to the UK government.