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Who We Are 

Michael D. O'Halleran

Michael D. O'Halleran

Executive Chairman, RyanRe Underwriting Managers

Mike O’Halleran, Executive Chairman of RyanRe, is a reinsurance veteran who has spent his entire career in the reinsurance sector. Prior to joining RSG as a senior advisor, Mike was Executive Chairman and founder of Aon Benfield, the largest reinsurance brokerage and capital advisory firm in the world. Aon Benfield has operations in more than 50 countries and employs in excess of 4,000 professionals.

Mike was previously President and COO of Aon Corporation and has held senior operating positions throughout his 40 year career in the insurance and reinsurance industry.

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