Louis Pasteur (1822-1895) was a French chemist and microbiologist, best known for his invention of the pasteurization process. He attended the École Normale Supérieure in Paris, earning a master's degree in science and an advanced degree in physical sciences before going on to earn his doctorate. He later married Marie Laurent and they had five children together, but only two survived until adulthood.

Throughout his career, Pasteur was an important figure in researching molecular asymmetry, and his works in fermentation supported the germ theory of disease. By 1863, Pasteur had developed the process which bears his name, reducing the amount of microorganisms in milk and other liquids. He also contributed to the principle of vaccination and successfully immunized a patient from rabies in 1885. In 1888, the Pasteur Institute was named for him in Paris.