Xavier Theimer‑Lienhard

Xavier Theimer‑Lienhard

AI Research Engineer at LiGHT, EPFL; contributing to medical LLM training and evaluation. Formerly visiting researcher at Yale University.

My main project is Meditron, creating state-of-the-art medical LLMs. My previous contributions include:

News

Publications

Paper Figure
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] The first fully open medical LLM.
Paper Figure
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] Open weight medical LLM built on Llama 3.1.
Paper Figure
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] Trained a GPT-2 poet that writes texts with rhymes.

Experience