G. W. L. Bier

G. W. L. Bier was a Dutch researcher who, in the early 20th century, developed a method to study blood flow and circulation. He is best known for inventing the "Bier block" or intravenous regional anesthesia, a technique that allows pain relief to be localized to a limb by temporarily trapping blood—and thus anesthetic drugs—within it. This method is widely used in surgeries on arms and legs. Bier's work significantly advanced understanding of blood circulation and contributed to safer, more effective anesthesia techniques in medicine.