Hello! I’m a third year PhD student in Applied Mathematics in the ML Foundations group at Harvard University, advised by David Alvarez-Melis. I am fortunate to be supported by a Kempner Graduate Fellowship at the Kempner Institute for the Study of Natural & Artificial Intelligence. My current research focuses on developing new and efficient methods for LLMs, in particular for test-time scaling and model distillation. I’m also very interested in masked diffusion models, and in diffusion models/flow matching more generally. I’ve worked a lot on optimal transport (OT) for machine learning, and utilized ideas from OT to derive rigorous machine learning algorithms. Previously, I completed my Bachelor’s and Master’s in mathematics at TU Berlin, including a year at UC Berkeley.
Feel free to reach out, I’m always happy to discuss research ideas! If you’re an undergrad or master’s student interested in working with me, please drop me an e-mail with [Interested in collaboration] in the subject line.
@misc{kangaslahti2025boomerang,author={Kangaslahti, Sara and Nayak, Nihal V. and Geuter, Jonathan and Fumero, Marco and Locatello, Francesco and Alvarez-Melis, David},title={{B}oomerang {D}istillation {E}nables {Z}ero-{S}hot {M}odel {S}ize {I}nterpolation},booktitle={arXiv preprint},url={https://arxiv.org/abs/2510.05064},year={2025}}
ICML (Workshop)
Guided Speculative Inference for Efficient Test-Time Alignment of LLMs
Jonathan Geuter, Youssef Mroueh, and David Alvarez-Melis
Accepted to 3rd Workshop for Efficient Systems for Foundation Models at ICML (Spotlight) , 2025
@inproceedings{Geuter2025GuidedSpeculative,author={Geuter, Jonathan and Mroueh, Youssef and Alvarez-Melis, David},title={{G}uided {S}peculative {I}nference for {E}fficient {T}est-{T}ime {A}lignment of {LLM}s},booktitle={3rd Workshop for Efficient Systems for Foundation Models at ICML (Spotlight)},url={https://arxiv.org/abs/2506.04118},year={2025}}
ICML
Universal Neural Optimal Transport
Jonathan Geuter, Gregor Kornhardt, Ingimar Tomasson, and Vaios Laschos
Accepted to Forty-second International Conference on Machine Learning (ICML) , 2025
@inproceedings{geuter2025universal,title={{U}niversal {N}eural {O}ptimal {T}ransport},author={Geuter, Jonathan and Kornhardt, Gregor and Tomasson, Ingimar and Laschos, Vaios},booktitle={Forty-second International Conference on Machine Learning (ICML)},year={2025},url={https://openreview.net/forum?id=t10fde8tQ7},}
Feel free to reach out to me at j[lastname] at g.harvard.edu
