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

Warren Buffett, Tim Cook, Bob Iger, and Doug McMillon are stepping down as CEOs of Berkshire Hathaway, Apple, Disney, and Walmart. Their successors—Greg Abel, John Ternus, John Furner, and Josh D'Amaro—are described as detail-oriented leaders who focus on operational execution rather than high-profile strategies.