Leonard Sloan: Something's Always Brewing! There are a few things that get Leonard Sloan really excited: exercising, gardening, and yeast! Whether he is talking about his days as an Assistant Brew Master or slicing into a loaf of freshly baked bread, yeast makes the things Leonard likes. In fact, while he told his story, Lenny was savoring freshly baked Panera bread with his coffee. Lenny has always been a pretty adventurous fellow and has always led a busy life. Having grown up in California, he started on his career path by studying fermentation science, at University of California – Davis.