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.

Mr. Miller was co-chief operating officer at St. Paul Travelers, joining OneBeacon in April. He has over 24 years of industry experience, with 14 years at Chubb and the last 10 at St. Paul where he ran the specialty businesses.

Mr. Cavoores joined White Mountain in 2000 and was named CEO of OneBeacon in 2003.

In a statement, Ray Barrette, CEO of White Moutain and chairman of OneBeacon, credited Mr. Cavoores with reinventing the company.

"We wish him and his family happiness as he transitions away from his White Mountains-OneBeacon family and would hope to work with him again in the future," he added.

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