Life and stock lessons from a billionaire value investor Mario Gabelli Billionaires By John Dobosz Mario Gabelli, chairman and chief executive officer of Gamco Investors Inc., center, during a shareholders shopping day ahead of the Berkshire Hathaway annual meeting in Omaha, Nebraska, U.S., on Friday, April 29, 2022. After hanging in the shadows for most of the pandemic, Warren Buffet and his deputies have been ramping up Berkshire Hathaway Inc.s Subscribe to Forbes Australia for full access to this and all articles today Subscribe Already a subscriber? Sign In