Chris Gardner's life story was immortalized in the movie "The Pursuit of Happyness." In the 1980s, he secured a spot in a brokerage training program while homeless and raising an infant son. Today he is a motivational speaker. In this interview, Gardner talks about his approach to life and how to succeed. "As a young guy, I knew I wanted to do something, and I wanted to become world class at it," he says. Gardner was a keynote speaker at last week's inaugural MAPI Executive Summit in Chicago.