"Warren Buffett, the legendary investor and one of the wealthiest men in the world, has used exactly the attributes we've explored in this chapter--intellectual persistence, prudent thinking, and the ability to see and act on warning signs--to make billions of dollars for himself and the shareholders in his company, Berkshire Hathaway. Buffett is known for thinking carefully when those around him lose their heads. "Success in investing doesn't correlate with IQ," he has said. "Once you have ordinary intelligence, what you need is the temperament to control the urges that get other people into trouble in investing."