Xavier Theimer‑Lienhard
I am a Machine Learning Research Engineer at the LiGHT Lab (EPFL IC School and Harvard T.H. Chan School of Public Health) and a core contributor to Meditron, a medical LLM project.
I specialize in full‑stack medical LLMs, focusing on pre/post‑training, RLHF/DPO/GRPO, evaluation, and scalable inference. Recently, I have been working on Meditron-3 (8B/70B) and the Moove evaluation framework.
Previously, I was a Visiting Researcher at Yale University (BIDS). I hold an MSc in Data Science from EPFL.
