Willem Einthoven was a Dutch medical doctor and physiologist. He invented the first practical electrocardiograph in 1895 and received the Nobel Prize in Physiology or Medicine in 1924 for it. The Nobel Prize in Physiology or Medicine 1924, announced October 23, 1924. Willem Einthoven, “for his discovery of the mechanism of the electrocardiogram”. Willem Einthoven: born 1860, Semarang, Java, Dutch East Indies (now Indonesia). Wiki link Data: the Nobel Foundation (CC0).