Allan MacLeod Cormack was a South African and American physicist, academic, and Nobel Laureate. He was Professor of Physics at Tufts University and won the 1979 Nobel Prize in Physiology or Medicine for his work on X-ray computed tomography (CT), a significant and unusual achievement since Cormack did not hold a doctoral degree in any scientific field. The Nobel Prize in Physiology or Medicine 1979, announced October 11, 1979. Allan M. Cormack and Godfrey N. Hounsfield, “for the development of computer assisted tomography”. Allan M. Cormack: born 1924, Johannesburg, South Africa. Godfrey N. Hounsfield: born 1919, Newark, United Kingdom. Wiki link Wiki link Data: the Nobel Foundation (CC0).