Investors often turn to Warren Buffett for advice for one good reason: He's proven his ability to navigate any investing waters -- from moments of euphoria to the doldrums -- and win over time. Buffett doesn't rush to buy the hottest stocks as markets soar and doesn't panic-sell during difficult periods.

Warren Buffett is widely considered one of the greatest investors ever because he has delivered excellent returns for a long time. The Oracle of Omaha's investing strategy was effective 10 years ago.

Warren Buffett, nicknamed the "Oracle of Omaha," is quite possibly the greatest investor of all time. For decades, the CEO of Berkshire Hathaway has shown his ability to read Wall Street like a