Karl Landsteiner (1868-1943), Austrian-US pathologist. In 1901 Landsteiner discovered three of the major human blood groups: A, B and O, and how to di
Karl Landsteiner (1868-1943), Austrian-US pathologist. In 1901 Landsteiner discovered three of the major human blood groups: A, B and O, and how to differentiate between them. His colleagues then discovered the fourth, AB. The correct blood type must be given in transfusions to avoid an immune reaction. Landsteiner joined the Rockefeller Institute, USA, in 1922, where he was involved in the discovery of the M, N and MN blood factors and the Rhesus (Rh) blood groups. He was awarded the 1930 Nobel Prize in Physiology or Medicine for his work on blood groups. Photographed in the period after 1923 when he was resident in the USA.
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