4 iconic American CEOs are on the way out. Meet the nuts-and-bolts leaders taking their place.

Source: Business Insider

From left: Greg Abel, John Ternus, John Furner, and Josh D'Amaro. Getty ImagesWarren Buffett, Tim Cook, Bob Iger, and Doug McMillon are making way for a new crop of CEOs. The new bosses of Berkshire Hathaway, Apple, Disney, and Walmart are nuts-and-bolts leaders.