Dr. Karl Landsteiner

Dr. Karl Landsteiner was an Austrian immunologist and pathologist best known for discovering the ABO blood group system in 1901, which revolutionized blood transfusion and transplantation medicine. By identifying different blood types, he helped prevent dangerous transfusion reactions, saving countless lives. Landsteiner's work earned him the Nobel Prize in Physiology or Medicine in 1930. He is also noted for his contributions to the understanding of the Rh factor and the development of serology, the study of blood serum and its components. His discoveries laid the foundation for modern blood typing and transfusion practices.