Rebecca Reidmakes small batches of beer for the world's largest brewer in search of the next big thing.

As brewmaster at Anheuser-Busch InBev's pilot brewery in St. Louis, the 29-year-old chemical engineer experiments with new beers in a scaled-down replica of the main brewery next door. Each batch of beer is just 10 barrels, barely a drop in the bucket for a company that ships 100 million barrels in the U.S. each year. Almost all of the 500 recipes she and her team brew each year never make it out of the building.

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