Karl Landsteiner

Karl Landsteiner was an Austrian immunologist and physician, renowned for his discovery of the human blood groups A, B, AB, and O in 1900, which revolutionized blood transfusion practices. His groundbreaking work earned him the Nobel Prize in Physiology or Medicine in 1930. Landsteiner's classification of blood groups is fundamental in modern medicine, ensuring safe blood transfusions and reducing the risk of transfusion reactions. Furthermore, his research laid the groundwork for future studies in immunology and genetics, highlighting the importance of blood compatibility in medical procedures.