- General Manager and Co-founder, Weights & Biases1
Lukas Biewald is a co-founder and the General Manager of Weights & Biases, the machine learning developer platform that Biewald founded in 2017 with Chris Van Pelt and Shawn Lewis and that CoreWeave acquired in May 2025. Biewald earlier founded CrowdFlower, later Figure Eight, to address the problem of getting training data for machine learning.123
At a glance
- Current role
- General Manager and Co-founder
- Company
- Weights & Biases
- Sector
- Company
- Work listed
- 2
- Sources cited
- 5
- Profile reviewed
Career
Biewald's 2019 essay on starting a second machine learning tools company recounts working on search before concluding, by 2007, that access to training data was the main obstacle for machine learning teams. Biewald left that job to start CrowdFlower, later renamed Figure Eight, which created labeled training data sets for companies.3
After stepping down as CEO of Figure Eight, Biewald spent time building deep learning projects and teaching introductory deep learning classes to engineers. Biewald then started Weights & Biases with longtime co-founder Chris Van Pelt and new co-founder Shawn Lewis; the company's about page dates the founding to 2017 and notes that CoreWeave acquired it in May 2025.31
Products and writing
Weights & Biases began with an experiment tracking tool developed to help build models at OpenAI, and Biewald's essay frames the product as basic software and best practices for managing machine learning models, which cannot be read or diffed like ordinary code. The company's Python SDK is published as open source under the MIT license.134
Biewald's publications page lists research co-authored with Daphne Koller on word-sense disambiguation for machine translation (EMNLP 2005) and papers on crowdsourcing quality, alongside guest articles on hardware and machine learning projects, such as a guide to building a deep learning machine.5
Work and contributions
Weights & Biases Python SDK (wandb) Open-source code
Co-founded the company behind the MIT-licensed wandb library, which grew out of an experiment tracking tool developed to help build models at OpenAI.14
Ensuring quality in crowdsourced search relevance evaluation Published research
Co-author, with John Le, Andy Edmonds and Vaughn Hester, of a 2010 SIGIR paper on how the distribution of training questions affects crowdsourced relevance judgments.5
Timeline
- Co-authored an EMNLP paper on word-sense disambiguation for machine translation with Daphne Koller.5
- Left a search job to found CrowdFlower, later Figure Eight, focused on training data.3
- Co-authored a SIGIR paper on quality in crowdsourced search relevance evaluation.5
- Co-founded Weights & Biases with Chris Van Pelt and Shawn Lewis.1
- Published an essay on starting a second machine learning tools company.3
- Weights & Biases was acquired by CoreWeave.1
Other documented roles
Roles the sources document that are not confirmed as current.
Where they work
- Weights & Biases 3 people in the wiki
Related people
- Chris Van PeltAlso at Weights & Biases
- Shawn LewisAlso at Weights & Biases
- Matei ZahariaTraining systems · Developer tools
- Jong Youl ChoiTraining systems · Datasets and data
- Steven HuelsDeveloper tools · Datasets and data
- Jeff HuberDatasets and data · Developer tools
- Manuvir DasDeveloper tools · Datasets and data
- William FalconTraining systems · Developer tools
- T.R. VishwanathDatasets and data · Developer tools
- Peter StaarDatasets and data · Developer tools
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References
5 sources · profile reviewed Oct 21, 2026 · data updated Oct 21, 2026