Young Investigator, Open Language Models for Biology

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Compensation: $

Ai2 is seeking a Postdoctoral Young Investigator to work on CellOLMo, a collaboration between Ai2's open language model researchers and scientists at the Allen Institute.

We are looking for a researcher who works at the intersection of machine learning and biology. You should have experience training or adapting transformer-based models and an interest in applying those methods to single-cell data. You may come from machine learning, computational biology, neuroscience, physics, or another quantitative field.

You will be expected to design careful experiments, work independently, and communicate with researchers from different disciplines. Because CellOLMo is an open-science project, you should also be committed to releasing code, data, and model weights for use by the broader research community.

CellOLMo is investigating how open language models can be used with single-cell brain data to answer biological questions. The project will initially focus on the SEA-AD Alzheimer's disease atlas and will examine data at several levels, from individual cells to brain regions and donors.

One of our main research questions is whether grounding a model in biological language and knowledge produces measurable improvements over models trained only on molecular data. We will also study whether those improvements persist when cells are combined into representations of brain regions, patients, pathology, and disease progression.

You will work directly with the project PI at Ai2 and collaborate with domain scientists at the Allen Institute for Brain Health. You will have access to Ai2's open language models, post-training infrastructure, and substantial GPU compute. We plan to release the resulting models, code, and research artifacts openly.

• Develop a multimodal language model that combines single-cell gene-expression data with text, using an open model such as OLMo.
• Reproduce and evaluate relevant approaches, including scGPT, Gene former, Cell Whisperer, and C2S-Scale.
• Adapt and improve these approaches for brain and neurodegeneration data.
• Design controlled experiments to test whether language grounding improves performance over cell-only and text-free baselines.
• Develop representations at the brain-region and donor levels that incorporate pathology and disease progression.
• Evaluate models on held-out donors using measures such as cell-type and marker recovery, agreement with known patterns of regional vulnerability, and expert review of plain-language answers.
• Work with Allen Institute scientists to interpret results and identify predictions suitable for experimental follow-up.
• Release data, code, and model weights, and prepare the results for publication.

• A completed PhD, or a PhD expected within one year, in machine learning, computational biology, computational neuroscience, physics, or a related quantitative field.
• Hands-on experience training or fine-tuning transformer-based language models.
• Strong Python and PyTorch skills.
• Experience writing reliable, reproducible research code.
• The ability to carry out independent research on open-ended problems.
• The ability to communicate clearly with both machine-learning researchers and biological scientists.

• Single-cell genomics, including scRNA-seq or snRNA-seq.
• Tools such as scanpy, Ann Data, or the scVI ecosystem.
• Multimodal models, instruction tuning, or language-model post-training.
• Neurodegeneration, brain atlases, or spatial transcriptomics.
• Public releases of research code, datasets, or model weights.

• Must be able to remain in a stationary position for long periods of time.
• The ability to communicate information and ideas so others will understand.
• Must be able to exchange accurate information in these situations.
• Must be able to observe details at close range.
• Can work under deadlines.

Ai2 is a Seattle based non-profit AI research institute founded in 2014 by the late Paul Allen. Our mission is building breakthrough AI to solve the world's biggest problems. We develop foundational AI research and innovation to deliver real-world impact through large-scale open models, data, robotics, conservation, and beyond.

In addition to Ai2's core mission, we also aim to contribute to humanity through our treatment of each member of t