The Hanover Insurance Group, Inc., (NYSE:THG), a leading property and casualty insurance company, announced today that John "Jack" C. Roche, president and chief executive officer, has informed the company's Board of Directors he plans to retire on December 31, 2026, following a distinguished 40-year career in the insurance industry. Richard "Dick" W. Lavey, chief operating officer and president of Hanover Agency Markets, has been appointed by the board as CEO-elect and will work closely with Roche to ensure a successful transition.