Liam Smeeth is the Director of the London School of Hygiene and Tropical Medicine and professor of clinical epidemiology. He is a global leader in the use of computerized health data for research. He was previously a Trustee of the British Heart Foundation and a non-executive director of the Medicines and Healthcare products Regulatory Agency. He is a member of the strategic oversight committee for UK Biobank and an elected Fellow of the Academy of Medical Sciences. He co-chairs the BMJ Commission on the Future of the NHS. In response to the Covid pandemic he co-led the creation of the OpenSafely resource.