Christopher Clark
Senior research scientist at Ai2 leading the open multimodal team; co-first author of Molmo and Molmo2
- Senior research scientist, leading the open-ecosystem multimodal team, Allen Institute for AI (Ai2)12
Christopher Clark is a senior research scientist at the Allen Institute for AI (Ai2), where Clark leads the open-ecosystem multimodal team working on vision-language models with a focus on openness, training efficiency and visual grounding. Clark is co-first author of the Molmo and PixMo paper and first-listed co-first author of the Molmo2 paper, and earlier worked on the Unified-IO line of any-to-any models.1342
Career
Research
Clark's earlier multimodal work centred on unified models: Unified-IO (2022) handled vision, language and multimodal tasks in one model, and Unified-IO 2 (2023) extended this to audio and action. Both papers list Clark as a co-first author.561
Clark's recent work is on the Molmo line of fully open vision-language models, which share weights, code and training data. The Molmo and PixMo paper (2024) received a CVPR 2025 Best Paper Honorable Mention, and the Molmo2 paper (2026), adding video understanding and grounding, was a CVPR 2026 best paper award candidate. Clark is also first author of MolmoPoint, on pointing with grounding tokens, at ECCV 2026.134
Work
Molmo2-O 7BOpen weights
First-listed co-first author of the Molmo2 paper, which describes the open-weight Molmo2 vision-language models with video understanding and grounding.41
MolmoOpen weights
Co-first author, with Matt Deitke, of the Molmo and PixMo paper introducing the Molmo family of open vision-language models and the PixMo datasets.31
Unified-IO and Unified-IO 2 (external site: arxiv.org)Published research
Co-first author of Unified-IO (2022) and Unified-IO 2 (2023), unified models spanning vision, language, audio and action.561
Career timeline
Jun 2022
Posted Unified-IO, a unified model for vision, language and multimodal tasks, as co-first author.5
Dec 2023
Posted Unified-IO 2, adding audio and action, as co-first author.6
Sep 2024
Posted the Molmo and PixMo paper as co-first author with Matt Deitke.3
2025
Received a CVPR 2025 Best Paper Honorable Mention for the Molmo and PixMo paper.1
2026
First author of MolmoPoint, on pointing with grounding tokens, listed for ECCV 2026.1
Jan 2026
Posted the Molmo2 paper on open vision-language models with video understanding as first-listed author.4
Honors and recognition
- CVPR Best Paper Honorable Mention (Molmo and PixMo) · IEEE/CVF Conference on Computer Vision and Pattern Recognition (CVPR), 20251
Related people
More sourced profiles at the same organization, in the same field, or from the same school.
- Akshita BhagiaAlso at Ai2
- Aditya RameshMultimodal models
- Ali FarhadiAlso at Ai2
- Dieter FoxAlso at Ai2
- Alexander KirillovMultimodal models
- Aylin CaliskanAlso from UW
- Hannaneh HajishirziAlso at Ai2
- Bin XiaoComputer vision
- Byron BootsAlso from UW
- Maarten SapAlso at Allen Institute for AI
- Christoph FeichtenhoferComputer vision
- Carlos GuestrinAlso from UW
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