Mika Laitinen lives in Finland close to traditional sahti brewers and has coauthored two books, one about sahti and one about homebrewing, in Finnish. His articles on sahti have appeared in several beer magazines, including Brew Your Own,and he writes about local Nordic beer culture on his website Brewing Nordic (www.brewingnordic.com).Randy Mosher is the author of Tasting Beer, Radical Brewing, Mastering Homebrew, A Beer for All Seasons, and The Brewer's Companion. He lives in Chicago, Illinois.