Steve Jobs simultaneously led two companies, Apple and Pixar, as chief executive. Elon Musk is running Tesla and SpaceX. Now more people are saying that Jack Dorsey can permanently run two companies at the same time, too.
Mr. Dorsey, 38, is the chief executive of Square, the mobile payments company that has quietly filed for an initial public offering. He is also the interim leader of Twitter, the social media company that he co-founded and that is searching for a new chief. While Mr. Dorsey has long been mentioned a...
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