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Builders & open source

Shawn Lewis

Distinguished Engineer and Cofounder, Weights & Biases

Shawn Lewis is a co-founder of Weights & Biases and is listed on its leadership page as Distinguished Engineer and Cofounder. Lewis founded the company in 2017 with Lukas Biewald and Chris Van Pelt, and is the first author listed in the package metadata of Weave, the company's open-source toolkit repository.12

At a glance

Current role
Distinguished Engineer and Cofounder
Sector
Company
Work listed
2
Sources cited
3
Profile reviewed

Career

Lewis co-founded Weights & Biases with Lukas Biewald and Chris Van Pelt in 2017. In a June 2019 post marking the product's public launch, Biewald described Lewis as a new co-founder and recounted six months of building the tool with Lewis, Van Pelt and early users.13

Weights & Biases began with an experiment tracking tool built to help develop models at OpenAI and was acquired by CoreWeave in May 2025. Its leadership page lists Lewis as Distinguished Engineer and Cofounder.1

Open-source work

Lewis is the first listed author in the pyproject metadata of the wandb/weave repository, the open-source Weave package maintained by Weights & Biases, with Tim Sweeney and other company engineers listed after.2

Work and contributions

  • W&B Weave Open-source code

    First of the authors listed in the Weave package's pyproject metadata, alongside Tim Sweeney and other Weights & Biases engineers.2

  • Weights & Biases Proprietary product

    Co-founded the company in 2017 with Lukas Biewald and Chris Van Pelt; Biewald's 2019 launch post describes building the first version of the tool with Lewis, Van Pelt and early users including OpenAI, Toyota Research and Uber.13

Timeline

  1. Co-founded Weights & Biases with Lukas Biewald and Chris Van Pelt.1
  2. Weights & Biases became public after six months of building with early users, per Biewald's launch post.3
  3. Weights & Biases was acquired by CoreWeave.1

Where they work

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References

3 sources · profile reviewed Oct 22, 2026 · data updated Oct 22, 2026

  1. About us | Weights & BiasesWeights & Biases · Official page · accessed Oct 22, 2026
  2. wandb/weave pyproject.toml (package authors)wandb (GitHub repository) · Repository · accessed Oct 22, 2026
  3. Starting a second machine learning tools company, ten years laterLukas Biewald · Announcement · published Jun 24, 2019 · accessed Oct 22, 2026