George Halal
Co-author of Contextual AI's open Reranker v2 models; machine learning software engineer at Google
George Halal is a machine learning software engineer at Google, according to Halal's own site. At Contextual AI, where Halal was a member of technical staff, Halal trained the company's instruction-following rerankers and is the first-listed author of the Reranker v2 release (August 2025), whose open-weight models come in 1B, 2B and 6B sizes. Halal earned a PhD in physics at Stanford University in July 2024.123
Career
Halal completed a PhD in physics at Stanford University in July 2024, with research that included computer vision methods for separating cosmological signals from foreground contaminants. Halal then worked on training language models and on production ranking and agentic retrieval systems, and now works as a machine learning software engineer at Google.1
Contextual AI work
Halal's site lists training an instruction-following reranker (v1) and then the open-sourced v2 family of multilingual instruction-following rerankers. Contextual AI's August 2025 post, by Halal and Director of Research Sheshansh Agrawal, released Reranker v2 in 1B, 2B and 6B sizes with quantized versions and three instruction-following evaluation datasets.12
Halal is also first-listed author of Contextual AI's November 2025 post describing an agentic alternative to GraphRAG, and Halal's site lists work on optimizing an agent's use of search and navigation tools.41
Work
Contextual AI Reranker v2 2BOpen weights
First-listed author in the model card's citation for Contextual AI Reranker v2 and of the blog post that released the 2B model with its 1B and 6B siblings.32
Contextual AI RerankerOpen weights
Trained Contextual AI's first instruction-following reranker (v1) and its open-sourced v2 family of multilingual instruction-following rerankers, according to Halal's site.12
Career timeline
Other documented roles
Roles the sources document but that are not confirmed as current.
- Member of Technical Staff (past), Contextual AI24
Related people
More sourced profiles at the same organization, in the same field, or from the same school.
- Abhimanyu DasAlso at Google
- Adina WilliamsLanguage models
- Abigail SeeAlso from Stanford
- Adam PaszkeAlso at Google
- Albert JiangLanguage models
- Abubakar AbidAlso from Stanford
- Alexei BaevskiAlso at Google
- Alexander WettigLanguage models
- Albert GuAlso from Stanford
- Amir HertzAlso at Google
- Ali GhodsiDatasets and data
- Andrej KarpathyAlso from Stanford
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