For many Americans - success means money and money means success. That's why even after the biggest financial crisis since the Great Depression - a job at a top-notch investment bank still holds allure for many young Americans starting their professional lives. But is working on Wall Street really worth it? For tonight's Conversations With Great Minds - I'm joined by someone who lived the life of a Wall Street millionaire and left it all behind. Sam Polk spent most of his 20's working as a trader for high-powered Wall Street investment firms - but at 30 he decided to leave the world of finance for good. Since then - he has become a successful nonprofit entrepreneur and has written about his time on Wall Street for The New York Times and Forbes Magazine.