From a handful of idealistic farmers and local co-ops in the 1960s to the domination of juggernauts like Whole Foods, the wild success of the natural and organic foods industry proves that principled business is not just possible, but profitable. With nearly unfettered double-digit annual growth, the development of this now-$88 billion industry is one of the most remarkable untold stories in American business history. Trailblazers like Mo Siegel of...