Louis Pasteur

Louis Pasteur was a French chemist. Pasteurization is named after this gentleman, who invented the process of heating solutions to kill the micro-organisms and molds present in them, so they would not spoil quickly. This helped the production of beer, milk, and wine. He also proved that fermentation was a result of microorganisms (yeast) processing carbohydrates, rather than a spontaneous reaction. This helped the understanding of how fruit was made into wine and grain into beer. It also led to an ammendment to the Reinheitsgebot to allow a fourth ingredient: yeast.