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
At a glance
- Current role
- Machine learning software engineer
- Company
- Sector
- Company
- Fields
- Language models, Datasets and data
- Education
- Stanford
- Work listed
- 2
- Sources cited
- 4
- Profile reviewed
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 and contributions
Contextual AI Reranker v2 2B Open 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 Reranker Open 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
Timeline
Other documented roles
Roles the sources document that are not confirmed as current.
- Member of Technical Staff (past), Contextual AI24
Where they work
- Google 121 people in the wiki
Related people
- Ashish VaswaniAlso at Google
- Sara HookerAlso at Google
- John X. MorrisAlso at Google
- Sridhar RamaswamyAlso at Google
- Aran KomatsuzakiAlso at Google
- Rohan TaoriLanguage models · Datasets and data
- Connor LeahyLanguage models · Datasets and data
- Oren EtzioniDatasets and data · Language models
- Sriram RaghavanLanguage models · Datasets and data
- Eugene YanLanguage models · Datasets and data
Suggest a correction or removal
Profiles cover public professional work only, and each statement cites a source. If something is out of date, missing or wrong, tell us and link a source. People can also ask for their profile to be corrected or removed.
References
4 sources · profile reviewed Oct 22, 2026 · data updated Oct 22, 2026