Emil von Behring was a German physician and Nobel laureate who developed the first antitoxin for diphtheria, revolutionizing modern medicine.
Salim Ali was an Indian ornithologist and naturalist who pioneered bird study and conservation in India, earning him the title "Birdman of India".
Max Theiler was a South African virologist who developed the first successful yellow fever vaccine, earning him the Nobel Prize in Physiology or Medicine in 1951.