John Cavoores, president and chief executive officer of OneBeacon Insurance Group, has left the company for personal reasons.
Mr. Cavoores, 48, will be replaced by Mike Miller, 46, who assumes the position immediately, said Bermuda-based White Mountains Insurance Group, Ltd., the parent company of the Boston-based insurer, on Friday.
Mr. Miller joined OneBeacon earlier this year as the company's chief operating officer. White Mountain said Mr. Cavoores "recruited his old friend" Mr. Miller as the likely successor.
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