One of Warren Buffett's key deputies is leaving Berkshire Hathaway. Todd Combs, the CEO of Berkshire-owned Geico, is joining JPMorgan to head up a new unit. The announcement comes alongside several executive changes ahead of Buffett's retirement as CEO. One of Warren Buffett's top lieutenants is leaving Berkshire Hathaway to join JPMorgan. Todd Combs, one of Buffett's two investment managers alongside Ted Weschler, and the CEO of Berkshire-owned Geico, will lead JPMorgan's $10 billion Strategic Inv ...