Book excerpt: Once a New York City cop, John McCormack made his first million on Wall Street in his twenties, and lost it before he was thirty. He went to work for—and learned from—savvy businessmen who had made it from the ground up. Blending their wisdom with his own entrepreneurial gifts, McCormack made a stunningly successful comeback. Here he shares his inspiring story as well as the lessons he's learned about motivation, setting goals, and how creative companies can bring the American dream to those born without a silver spoon.