Atlas
Back to Insurance Brokerage
Strategic Advisor·Insurance Brokerage

Michael D. O'Halleran

Executive Chairman; Senior Advisor & Board Member at Geneva Re Limited; Ryan Specialty

Chicago, Illinois, USA

MD
Why they matter

A 40-year reinsurance power broker who built Aon Re into a global #1 and now chairs a live Bermuda reinsurer, giving him current market intel on capacity and pricing.

Background

Michael D. O'Halleran is a 40+ year veteran of the insurance and reinsurance industry who founded Aon Re (later Aon Benfield) and built it into the world's largest reinsurance brokerage over a 24-year tenure as Executive Chairman, after also serving as President and COO of Aon Corporation from 1999 to 2005. He is currently Executive Chairman of Geneva Re Limited, the Bermuda-based reinsurer he helped launch as a joint venture between Ryan Specialty and Nationwide, and sits on Ryan Specialty's board (since 2018) as a senior advisor.

Notable deals

  • 2019
    Co-launched Geneva Re Ltd., a Bermuda-based reinsurer formed as a 50/50 joint venture between Ryan Specialty Group and Nationwide; O'Halleran named Executive Chairman
  • 2016
    Elected independent director and Audit Committee member of NuVasive, Inc.'s Board of Directors
  • 2007
    Appointed Executive Chairman of Aon Re Global after 21 years at Aon, handing CEO duties to Ted Devine while retaining client and strategic leadership

Call-prep brief

Background

  • Founder and 24-year Executive Chairman of Aon Re/Aon Benfield, the reinsurance brokerage he built into the world's largest
  • Former President & COO of Aon Corporation (1999–2005)
  • Since 2019, Executive Chairman of Geneva Re Limited, a Bermuda reinsurer formed as a Ryan Specialty/Nationwide JV
  • Ryan Specialty board member since 2018 (Audit Committee) and senior advisor to the firm
  • Independent director experience outside insurance: NuVasive (2016–), formerly Cardinal Health and CareFusion

Current Focus

  • Steering Geneva Re's underwriting strategy and capital deployment in a hardening reinsurance market
  • Advising Ryan Specialty's leadership on strategy as the firm continues its wholesale/MGA roll-up

What They Care About

  • Reinsurance capacity, alternative capital, and broker-carrier alignment
  • Governance quality on the boards he serves (audit committee focus on financial controls)
  • Chicago civic and philanthropic ties (Economic Club, Commercial Club, Providence St. Mel, Ireland Fund)

Recent Moves

  • Continues in dual chairman/advisor roles at Geneva Re and Ryan Specialty as Ryan Specialty scales post-2021 IPO
  • Long-standing Venturewave Capital Global Advisory Council member, signaling appetite for advisory work with growth-stage financial services firms

Sensitivities

  • Emeritus/advisory status at Ryan Specialty means he may defer operational questions to current management
  • Aon ties run deep (21+ years) — frame comparisons to Aon's current reinsurance business carefully

Questions to Ask

  1. How is Geneva Re's capital base and underwriting appetite evolving amid current reinsurance pricing trends?
  2. What does he see as the biggest structural shift in wholesale broking/MGA consolidation since Ryan Specialty's IPO?
  3. Given his Aon Re founding experience, what due diligence red flags does he look for in a reinsurance intermediary platform?

Outreach draft

Subject
Insurance/reinsurance perspective for an upcoming diligence
Dear Mr. O'Halleran, I'm reaching out from a private equity firm evaluating opportunities in the insurance brokerage and MGA space. Given your career building Aon Re into the world's leading reinsurance brokerage, and your current vantage point chairing Geneva Re and advising Ryan Specialty, we'd value a brief conversation on where you see consolidation and capacity trends heading in wholesale distribution. Would you have 20-30 minutes in the coming weeks for a call? We're happy to work around your schedule and would compensate for your time through our standard expert network arrangement. Thank you for considering, and I look forward to hopefully connecting. Best regards, [Placeholder Name]

Linked companies

Sources