author
Louis Pasteur
1822–1895
A chemist who changed medicine, food safety, and public health, he helped show that tiny organisms could cause fermentation and disease. His work led to pasteurization and early vaccines, making his name familiar far beyond the laboratory.
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About the author
Born in Dole, France, on December 27, 1822, Louis Pasteur became one of the key scientific figures of the 19th century. Trained as a chemist, he first made his mark through research on crystals, then moved into questions that connected chemistry, biology, and everyday life.
His most famous achievements came from studying microbes. He showed that fermentation was driven by living organisms, challenged the idea of spontaneous generation, and helped establish the germ theory of disease. That work opened the way for major advances in hygiene and medicine, and it also gave the world pasteurization, the heat-treatment process named after him.
Later in his career, he worked on diseases affecting animals and humans, including anthrax and rabies, and became widely celebrated in France and beyond. He died on September 28, 1895, but his influence still reaches across modern microbiology, vaccination, and public health.