(NewWorldWinemaker) - Have you met Brett? Brett is mentioned so often in the wine industry that you might think he's Robert Parker's protégé nephew. Not so, but the truth is just as controversial. Brett, known technically as Brettanomyces bruxellensis, is a yeast. That puts it into the same category as our old friend Saccharomyces cerevisiae, used for millennia to ferment juice into wine, and make bread rise.