Todd Combs, one of Warren Buffett's handpicked investment lieutenants and a key executive at Geico, Berkshire Hathaway' s crown jewel insurance business, is leaving the conglomerate after a 15-year tenure that helped define the firm's post-Buffett transition. Combs, 54, first caught the attention of Buffett's late partner Charlie Munger, who famously recounted receiving an unsolicited letter from the former hedge fund manager. "He sent me a letter. That's how it happened," Munger said in 2011. "And at any rate, I had a meal with him, and then I called Warren and said, 'I think this is the guy you should talk to.'" Combs joined Berkshire in 2010 and spent 15 years wearing two hats — helping oversee a portion of its sprawling public-equity portfolio while also running Geico, where he became

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