
Jordan HoffmannResearcher
Microsoft AI
via Microsoft AI
Researcher · Engineer
Member of Technical Staff at Microsoft AI
Groeneveld led pretraining engineering for OLMo, one of the first competitive language-model families released with its training data, code and checkpoints. That unusually complete openness gave researchers a way to inspect how large models are built; he now works at Microsoft AI.
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Last editorial review: August 9, 2026