Elie Metchnikoff

Born in 1845 near Kharkiv in the Russian Empire, Élie Metchnikoff became a zoologist and microbiologist whose work shaped modern immunology. He is best known for discovering phagocytosis—the process by which certain cells surround and digest foreign material—which became a cornerstone of the body’s immune response. In 1908, he shared the Nobel Prize in Physiology or Medicine with Paul Ehrlich for their work on immunity.

Metchnikoff worked in several scientific centers before joining the Pasteur Institute in Paris, where he carried out much of his most influential research. His studies connected careful observation in animals with major medical ideas, helping move immunity from speculation toward experimental science.

He also wrote about aging, digestion, and the role of beneficial bacteria, showing an interest in health that went beyond the laboratory bench. That mix of sharp experimentation and wide-ranging curiosity is part of why he remains such a memorable figure in the history of science.