Joe Spisak
VP of Product and Head of Open Source at Reflection AI; PyTorch core maintainer
- Vice President of Product and Head of Open Source, Reflection AI132
- Serves on the PyTorch Foundation Governing Board, PyTorch Foundation1
- Core Maintainer, PyTorch (open-source project)41
Joe Spisak is Vice President of Product and Head of Open Source at Reflection AI, a PyTorch core maintainer, and a member of the PyTorch Foundation Governing Board, according to PyTorch's May 2026 release Q&A page, which also notes Spisak's earlier work at Meta. "The Llama 3 Herd of Models" (2024) lists Spisak among the Llama 3 core contributors. At PyTorch Conference Europe 2026, Spisak gave the keynote "Community Led Open Source RL."1453
Work
PyTorchOpen-source code
Listed as one of PyTorch's core maintainers on the project's maintainers page. The repository is under a BSD-style license.47
Llama 3Open weights
Listed among the core contributors in "The Llama 3 Herd of Models" (2024), defined there as people who worked on Llama 3 for at least two-thirds of the project's runtime; the paper's abstract states that Meta publicly released Llama 3, including the 405B-parameter model.56
Other documented roles
Roles the sources document but that are not confirmed as current.
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