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You never really know someone until you work with them, right? Or maybe it’s the opposite: you never really know the people you work with. Regardless, one thing’s for certain: You never know what goes on behind closed (boardroom) doors. One of today’s most fascinating stories peels back the layers on Mark Donegan, the newest of Warren Buffett’s “all-star” CEOs. File this one under “management tips.” —Megan Hess

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