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1813–1858
Best known for tracing a deadly cholera outbreak to London’s Broad Street pump, this pioneering physician helped change how people understood disease. He also played a major role in making anesthesia safer and more scientific.
Born in York, England, in 1813, John Snow trained as a physician and built his career in London. He is widely remembered for his careful investigation of cholera outbreaks, especially his famous 1854 study in Soho, where he linked many cases to a contaminated public water pump.
That work made him an early pioneer of epidemiology because he combined observation, mapping, and practical evidence to challenge the common ideas of his day about how disease spread. His findings later became a landmark in public health history.
Snow was also an important figure in the development of anesthesia. He studied how anesthetic gases worked, designed inhalers, and became well known for administering chloroform to Queen Victoria during childbirth. He died in London in 1858, but his influence on medicine and public health has lasted ever since.