Warren Buffett Retires | Who Is 'Wizard Of Investing' & CEO Of Berkshire Hathaway, Warren Buffett Warren Buffett is retiring as Berkshire Hathaway CEO, and as he exits the stage after six decades, the spotlight turns not just on his successor Greg Abel, but also to one of his legacies. It's a market valuation tool that's now sounding the alarm. At 95, the “Oracle of Omaha” concludes a celebrated career that included landmark acquisitions, such as the Burlington Northern railroad, and decades of value investing inspired by Benjamin Graham, as well as annual letters packed with quotes that have become required reading for investors worldwide. Yet perhaps no contribution has gripped Wall Street more than the market gauge that unofficially bears his name.