HEN GARY HIRSHBERG joined Stonyfield Farm in 1983, it was just, as it touts, “seven cows and a dream.” But there were still plenty of night terrors: A bad deal with a new dairy cost the company millions; it didn't break even until nine years in. But from there, Hirshberg built Stonyfield into the world's top organic yogurt producer, with annual revenue nearing $100 million—before a gradual acquisition
