The "most successful investor of the 20th century" has a thing or two to teach you about being a great leader. Warren Buffett is a famed philanthropist, business magnate and shark-like investor. As the CEO and biggest shareholder of Berkshire Hathaway and someone who consistently ranks among the richest people in the world, he's smart, business savvy and slick, even into his 80s.
However, the "Oracle of Omaha" is also a notoriously frugal spender and reveres value investing. Having pledged to donate 99 percent of his wealth, he's proof that sometimes old-school techniques work.