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Ce Zhang

Founder and CTO of Together AI; Neubauer Associate Professor of computer science at the University of Chicago

  • Founder & CTO, Together AI21
  • Neubauer Associate Professor, Department of Computer Science, University of Chicago1

Ce Zhang is the CTO of Together AI, which lists Zhang among its founders, and a Neubauer Associate Professor in the Department of Computer Science at the University of Chicago; before that, Zhang was an Associate Professor at ETH Zurich. Zhang's research looks at the tension between data, models, computation and infrastructure, with a focus on machine learning platforms and systems that are data-centric, human-centric and declaratively scalable. Zhang is a co-author of the RedPajama paper, which describes an open dataset for training large language models, and of the Holistic Evaluation of Language Models (HELM) paper. Zhang completed a PhD at the University of Wisconsin-Madison and a postdoc at Stanford, both advised by Chris Ré.1236

Work

  • RedPajamaOpen data

    Co-author of "RedPajama: an Open Dataset for Training Large Language Models" (2024), whose listed affiliations include Together AI and the University of Chicago; the paper releases the RedPajama-V1 and RedPajama-V2 datasets. The RedPajama-Data repository, which holds the code for preparing the datasets, is Apache-2.0.345

    Project page (external site: github.com)

  • HELM (Holistic Evaluation of Language Models)Published research

    Co-author of "Holistic Evaluation of Language Models" (2022); the paper's author-contributions appendix credits Zhang with managing the Together Research Computer infrastructure used to evaluate the open models.67

    Project page (external site: arxiv.org)

Other documented roles

Roles the sources document but that are not confirmed as current.

This profile covers public professional work only, from the sources below. It is not an endorsement or a ranking. To correct or remove it, use the correction form.

Sources · reviewed Oct 13, 2026

  1. 1.
    Ce Zhang — homepage (external site: zhangce.github.io)

    Ce Zhang · Official page · accessed Oct 13, 2026

  2. 2.
    About Us | Together AI (team listing) (external site: together.ai)

    Together AI · Official page · accessed Oct 13, 2026

  3. 3.
  4. 4.
  5. 5.
    togethercomputer/RedPajama-Data repository (Apache-2.0 license) (external site: github.com)

    Together AI (GitHub repository) · Repository · accessed Oct 13, 2026

  6. 6.
    Holistic Evaluation of Language Models (arXiv 2211.09110) (external site: arxiv.org)

    arXiv · Paper · published Nov 16, 2022 · accessed Oct 13, 2026

  7. 7.

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