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Julian Minder

Julian (Konstantin) Minder

About Me

I am a PhD student at DLAB at EPFL and currently an Anthropic Fellow in London. I am supervised by Prof. Robert West and co-advised by Prof. Ryan Cotterell (ETH Zurich).

I am passionate about understanding and improving artificial intelligence systems. My work focuses on understanding how models learn during pretraining and how this shapes their behavior through interpretability research. I aim to better understand how these systems work and how we can make them safer.

I completed my master's degree in computer science at ETH Zurich in 2024, following earlier studies in computer science and neuroinformatics at the University of Zurich. I wrote my master's thesis at EPFL under Bob West and Chris Wendler, investigating the mechanistic effects of fine-tuning language models (awarded the ETH medal).

I was a research scholar at MATS 7 working together with Clement Dumas under the mentorship of Neel Nanda to study the differences between base and instruct models.

Previously, I worked on Model Diffing, a research area focused on understanding the differences between two language models, which I mainly used to study the effects of finetuning. Currently, I'm moving towards understanding pretraining as a whole, as I believe it leaves strong priors that shape a model's later behavior, while its influence remains poorly understood.

Please feel free to reach out anytime!

For students:

If you're interested in doing a project with me, please reach out via email with the subject "[STUDENT PROJECT] ...", telling me a bit about yourself and your interests. I mainly look for students on master's level and/or with a strong background in machine learning. For EPFL students: Please additionally also apply via our lab application system.

News

Dec 2025
I was awarded the Swiss AI PhD Fellowship 2025.
Mar 2025
I was awarded a 1-year scholarship for my work at MATS 7.

Highlighted Publications

2026

Synthetic Persona Pretraining: Alignment from Token Zero

Julian Minder*, Viktor Moskvoretskii*, Raghav Singhal*, Difan Jiao, Andy Arditi, Shaobo Cui, Yiderigun Borjigin, Kartik Bali, Stefan Krsteski, Harsh Raj, Huu Nguyen, Jannik Brinkmann, Ashton Anderson, Roland Aydin, Robert West

arXiv preprint

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