Lukas Zierahn
Postdoc at CWI & Booking.com
I am working with Wouter Koolen and Christina Katsimerou on Best-Arm Identification.
Previously, I obtained my PhD as part of the ELLIS program supervised by Nicolò Cesa-Bianchi and Gergely Neu working on adversarial bandits, and defended my dissertation summa cum laude in October 2026.
Before that, I graduated with an MSc in “Data Science and Machine Learning” from UCL with Distinction in 2021 and an BSc in “Mathematics” from Lancaster University with First-Class Honours in 2020.
In my free time I enjoy playing guitar and chess.
Selected Publications
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Zierahn, L., van der Hoeven, D., Lancewicki, T., Rosenberg, A., & Cesa-Bianchi, N. (2025). A Unified Analysis of Nonstochastic Delayed Feedback for Combinatorial Semi-Bandits, Linear Bandits, and MDPs. Journal of Machine Learning Research, 26(104), 1-60. http://jmlr.org/papers/v26/24-0496.html
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Zierahn, L., van der Hoeven, D., Cesa-Bianchi, N., & Neu, G. (2023). Nonstochastic Contextual Combinatorial Bandits. Proceedings of The 26th International Conference on Artificial Intelligence and Statistics, 8771-8813. https://proceedings.mlr.press/v206/zierahn23a/zierahn23a.pdf