There are quite a lot Viennese historical personalities nobody really knows. What did they do? Why are they important?
Karl Landsteiner is one of them.

Althought his picture was printed on the old 1000 Austrian Schilling banknotes he still was rather unknown.

Karl Landsteiner, a Viennese medical doctor and immunologist, classified the bloods of human beings into the now well-known A, B, AB, and O groups and showed that transfusions between individuals of groups A or B do not result in the destruction of new blood cells and that this catastrophe occurs only when a person is transfused with the blood of a person belonging to a different group.
One of the most important medical discouveries of the 20th century.
For his discovery he was awarded the Nobel Prize in Medicine in 1930.

Link

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