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Brian Duperreault

Chairman & CEO

Brian Duperreault is Chairman and Chief Executive Officer of Hamilton Insurance Group, the Bermuda-based holding company of property and casualty insurance and reinsurance operations in Bermuda, the US and the UK.

Mr. Duperreault was President and Chief Executive Officer of Marsh & McLennan Companies from 2008 to 2012. Before joining Marsh, he served for four years as non-executive Chairman of ACE Limited, an insurance and reinsurance company, CEO of ACE Limited from October 1994 through May 2004, and as the Company’s President from October 1994 through November 1999.

Prior to joining ACE, Mr. Duperreault served in various senior executive positions with American Insurance Group (AIG) and its affiliates from 1978 to 1994.

Mr. Duperreault is Chairman of Attune, the data-enabled company established by Hamilton Insurance Group, AIG and Two Sigma, and Chairman of the Board of Directors of Blue Marble Microinsurance. He is the former Chairman of the Board of Overseers of the School of Risk Management of St. John’s University, New York.

Mr. Duperreault is a member of the Boards of the International Insurance Society, the IESE Business School, the Insurance Information Institute and the Bermuda Institute of Ocean Studies (BIOS), and is a former Member of the Association of The Metropolitan Opera, New York. He serves on Johnson Controls’ Board of Directors.