Full-length presentation from NHC 2014 “Influence of the Mash on Sour Beer Production” by Michael Tonsmeire. Tonsmeire is popular for his Mad Fermentationist blog about his homebrewed adventures with sour beers and is the author of the book American Sour Beers. In this presentation, he discusses the importance of the mash as it relates to sour beer production, and also includes advice on fermentation as well as yeast/bacteria strains.