laureates in Physiology or Medicine People from Johannesburg People from Winchester, Massachusetts South African emigrants to the United States South African inventors South African Nobel laureates 20th-century South African physicists Tufts University faculty Academic staff of the University of Cape Town University of Cape Town alumni X-ray computed tomography White South African people South African people of Scottish descent Members of the United States National Academy of Sciences Fellows of the American Physical Society Members of the National Academy of Medicine