The Upstarts Podcast Harvey's Winston Weinberg: From Law Associate To $11 Billion Legal AI Startup CEO
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Mar 26, 2026 
Winston Weinberg, co-founder and CEO of Harvey and former law associate, built a legal AI startup that serves thousands of lawyers. He recounts testing GPT-3, cold-emailing Sam Altman, tailoring risky demos to win skeptical law firms, nearly doing a one-shot merger, and navigating competition from major AI labs like Anthropic.
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Cold Email To OpenAI Sparked Harvey
- Winston Weinberg cold-emailed Sam Altman and OpenAI's GC after testing GPT-3 on 100 landlord-tenant Reddit questions and getting attorney-approved answers.
- Three attorneys said 86 of 100 AI-generated responses required no edits, which launched Harvey's outreach to OpenAI and validated the product idea.
Three People Onboarded 4,000 Users Overnight
- Harvey onboarded 4,000 users at Allen & Overy with a three-person team and managed support in intense rotations without sleep for days.
- The UK adopted generative AI faster because banks in the US initially banned firms from using it, creating Harvey's first large customers abroad.
Built In Review Flows Make AI Safer For Law
- Law firms already contain review flows that absorb AI hallucinations: partners decompose tasks and juniors iterate drafts, creating natural checks.
- That structural workflow makes generative AI useful despite occasional errors because outputs pass through multi-level review before delivery.