Louis Pasteur (1822-1895) Professor at Strasbourg (1849), Lille (1854), Ecole Normale Superieure (1857) Stereochemistry and chirality Manually separated the left- and right-handed crystals of racemic sodium ammonium tartrate and explained the effect of polarized light on their solutions Explained how racemates could be separated by non-mechanical means Described the consumption of one enantiomer in racemates with enzymes