Xavier Theimer‑Lienhard

News

May 2026

Released MeditronFO (preprint, 🤗models, blog), first fully open medical LLM.
Feb 2026

Got accepted into the EDIC fellowship PhD program.
Apr 2025

Completed MSc thesis (report) at Yale University.
Dec 2024

Meditron-3 (paper, 🤗models) accepted at AAAI GenAI4Health workshop.
Dec 2024

Invited speaker at the Meta Open‑Source AI Summit.
Oct 2024

Started as a visiting researcher at Yale University.

Publications

Fully Open Meditron: An Auditable Pipeline for Clinical LLMs
X. Theimer-Lienhard, M. El-Amin, F. Elhassan, S. Vaidya, V. Cartier-Negadi, D. Sasu, L. Klein, M.-A. Hartley
preprint
[PDF] [Code] [Data] [Models] [Demo] [BibTeX] The first fully open medical LLM.

@misc{theimerlienhard2026fullyopenmeditronauditable,
  title={Fully Open Meditron: An Auditable Pipeline for Clinical LLMs},
  author={Xavier Theimer-Lienhard and Mushtaha El-Amin and Fay Elhassan and Sahaj Vaidya and Victor Cartier-Negadi and David Sasu and Lars Klein and Mary-Anne Hartley},
  year={2026},
  eprint={2605.16215},
  archivePrefix={arXiv},
  primaryClass={cs.AI},
  url={https://arxiv.org/abs/2605.16215}
}

Llama-3-Meditron: An Open-Weight Suite of Medical LLMs Based on Llama-3.1
A. Sallinen, A.-J. Solergibert, M. Zhang, G. Boyé, M. Dupont-Roc, X. Theimer-Lienhard, E. Boisson, B. Bernath, H. Hadhri, A. Tran, T. Rabbani, T. Brokowski, Meditron Medical Doctor Working Group, T. G. J. Rudner, M.-A. Hartley
AAAI 2025 (GenAI4Health)
[PDF] [Models] [BibTeX] Open weight medical LLM built on Llama 3.1.

@inproceedings{sallinen2025llama3meditron,
  title={Llama-3-Meditron: An Open-Weight Suite of Medical {LLMs} Based on Llama-3.1},
  author={Sallinen, A. and Solergibert, A.-J. and Zhang, M. and Boy{\'e}, G. and Dupont-Roc, M. and Theimer-Lienhard, X. and Boisson, E. and Bernath, B. and Hadhri, H. and Tran, A. and Rabbani, T. and Brokowski, T. and {Meditron Medical Doctor Working Group} and Rudner, T. G. J. and Hartley, M.-A.},
  booktitle={AAAI 2025 Workshop on Generative AI for Health (GenAI4Health)},
  year={2025},
  url={https://openreview.net/forum?id=ZcD35zKujO}
}

GPoeT: a Language Model Trained for Rhyme Generation on Synthetic Data
A. Popescu-Belis, À. R. Atrio, B. Bernath, E. Boisson, T. Ferrari, X. Theimer-Lienhard, G. Vernikos
ACL SIGHUM 2023 (LaTeCH-CLfL)
[PDF] [BibTeX] Trained a GPT-2 poet that writes texts with rhymes.

@inproceedings{popescu-belis-etal-2023-gpoet,
  title={{GP}oe{T}: a Language Model Trained for Rhyme Generation on Synthetic Data},
  author={Popescu-Belis, Andrei and Atrio, {\`A}lex R. and Bernath, Bastien and Boisson, Etienne and Ferrari, Teo and Theimer-Lienhard, Xavier and Vernikos, Giorgos},
  booktitle={Proceedings of the 7th Joint {SIGHUM} Workshop on Computational Linguistics for Cultural Heritage, Social Sciences, Humanities and Literature},
  month=may,
  year={2023},
  address={Dubrovnik, Croatia},
  publisher={Association for Computational Linguistics},
  url={https://aclanthology.org/2023.latechclfl-1.2/},
  doi={10.18653/v1/2023.latechclfl-1.2},
  pages={10--20}
}

Experience

2026–Pres.

PhD student at LiGHT
2025–2026

Research Engineer at LiGHT
2024–2025

Visiting Researcher at Yale
2023–2025

AI Intern at LiGHT
2023-2025

MSc EPFL (Artificial Intelligence)
Summer 2023

AI intern at Irbis Consulting SA
2018-2023

BSc EPFL (Computer Science)