John Brereton Barlow, South African cardiologist and physician (died 2008)

John Brereton Barlow was a world-renowned South African cardiologist. He qualified as a doctor in 1951, gained experience as a registrar in Hammersmith Hospital and the Royal Postgraduate Medical School in London. In the late 1950s he returned to South Africa to Johannesburg Hospital where he became Professor of Cardiology in the research unit and carried out significant studies on cardiac disorders as well as discovering the cause of a well known mitral valve disorder.