Sir Martin Jonathan Landray (born ) is a British physician, epidemiologist and data scientist who serves as a Professor of Medicine & Epidemiology at the University of Oxford. Landray designs, conducts and analyses large-scale randomised control trials; including practice-changing international trials that have recruited over 100,000 individuals. Landray previously led the health informatics team that enabled the collection and management of data for the UK Biobank on over half a million people.
