Reproduction crystal models belonging to Pasteur, c 1845-1855.
© Science Museum / Science & Society Picture Library
Louis Pasteur (1822-1895) is renowned for his work in stereochemistry as well as his germ theory of fermentation and disease and development of vaccines. Pasteur's doctorate was in the field of crystallography and led him to pioneering studies in what became known as stereochemistry. He demonstrated the existence of optical isomers and devised various techniques of separating them.