One after another, the lights were turning red on the young Leonard Green. He had a bad stutter that made him an introvert in mixed company. Dyslexic, too. Couldn't keep numbers in his head: hardly, as such, an accountant in the making. Sure enough, he'd now been fired from a fourth job in a row. "I didn't even know what an entrepreneur was," Green recalls now. "But it turned out to be somebody who thought outside the box, and took calculated risks, and spotted opportunities. And--boom! I suddenly realized that...