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John J. Byrne: Profile, Experience & Investments | Startup Intros

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JOHN J. BYRNE

Founder at White Mountains Insurance Group

ActiveFounder Investor

Updated: Apr 2, 2026 ·

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Quick Facts

Role: Founder
Company: White Mountains Insurance Group
Status: Active
Type: Founder, Investor

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Experience

FounderFounderCurrent

White Mountains Insurance Group

Present - Present

Frequently Asked Questions

Who is John J. Byrne?

John J. Byrne is Founder at White Mountains Insurance Group.

What companies has John J. Byrne founded?

John J. Byrne co-founded White Mountains Insurance Group.