PeopleofSuperintelligence

Builder

Winston Weinberg

Winston Weinberg is the co-founder and CEO of Harvey, which builds AI tools for legal work. He studied at Kenyon College and USC Gould, then practiced securities and antitrust litigation at O’Melveny & Myers before co-founding Harvey in 2022. With Gabe Pereyra, he tested GPT-3 on legal questions, and Harvey’s work spans legal research, document drafting and agent workflows. Harvey had more than 500 customers in 54 countries by August 2025, and TIME named Weinberg to its 2026 TIME100 AI list.

Now at
Harvey
Photo of Winston Weinberg

Timeline

  1. By 2022

    Law and litigation

    He holds a bachelor’s degree from Kenyon College and a Juris Doctor from the University of Southern California Gould School of Law. Before co-founding Harvey in 2022, he works as an associate at O’Melveny & Myers, specializing in securities and antitrust litigation.

  2. 2022

    Building legal AI

    In 2022, he and Gabe Pereyra test GPT-3 on legal questions and co-found Harvey. By November 2022, the company emerges from stealth with $5 million from OpenAI’s Startup Fund and a natural-language interface for legal research and document drafting.

  3. September 2024

    Legal agents with OpenAI

    In September 2024, he and Gabe Pereyra describe Harvey’s work with OpenAI o1 on legal agents and workflows. The team evaluates models with benchmarks and reviews by lawyers on complex legal tasks.

  4. February 2025

    A $300 million Series D

    In February 2025, he and Gabe Pereyra announce Harvey’s $300 million Series D at a $3 billion valuation, led by Sequoia. Harvey reports 235 customers in 42 countries at the end of 2024.

  5. August 2025

    More than 500 customers

    By August 2025, Harvey serves more than 500 customers in 54 countries and employs 350 people. The company highlights its Words to Workflow launch and Deep Research integration.

  6. May 2026

    Harvey Moot for case prep

    In May 2026, he and Gabe Pereyra write about Harvey Moot, a custom version of Harvey created with Neal Katyal’s team for Supreme Court case preparation. They plan to bring the tool to law school classrooms so students can practice with legal arguments.

  7. August 2026

    A TIME100 AI selection

    In August 2026, TIME names him to its TIME100 AI list as Harvey’s co-founder and CEO. Harvey’s legal models use mostly synthetic data, and the company serves more than 75 of the U.S.’s 100 highest-grossing law firms.

  8. As of October 2026

    CEO of Harvey

    As of October 2026, he is Harvey’s CEO and co-founder. In October 2026, Harvey announces plans for a Tokyo office in early 2027, and he says a local team will guide product development around Japanese legal professionals’ needs.

Sources and credits

Photo: harvey.ai; Winston Weinberg, Author at Harvey; creator not stated. License: Not stated by source. Source: harvey.ai. Cropped to a square and resized. Ask us to remove or replace this photo.

  1. Winston Weinberg, Author at Harvey harvey.ai. Checked 14 October 2026.
  2. How Harvey’s 31-Year-Old CEO Winston Weinberg Is Reshaping Big Law with A.I. observer.com. Checked 14 October 2026.
  3. Harvey, which uses AI to answer legal questions, lands cash from OpenAI techcrunch.com. Checked 14 October 2026.
  4. Harvey is building legal agents and workflows with OpenAI o1 harvey.ai. Checked 14 October 2026.
  5. Harvey Raises $300M Series D Led by Sequoia harvey.ai. Checked 14 October 2026.
  6. Harvey's Three Year Anniversary harvey.ai. Checked 14 October 2026.
  7. The Supreme Case for Harvey harvey.ai. Checked 14 October 2026.
  8. Winston Weinberg: The 100 Most Influential People in AI 2026 time.com. Checked 14 October 2026.
  9. Harvey to Open Tokyo Office harvey.ai. Checked 14 October 2026.