Charilaos (Charis) Pipis
(pronounced like "Harry")
Hello!
I'm a third-year PhD student at MIT, extremely fortunate to be advised by Costis Daskalakis and Gabriele Farina.
In the summer of 2025, I had the pleasure of interning at the Microsoft Research AI Frontiers team under the mentorship of Shivam Garg and Dimitris Papailiopoulos.
I completed my undergraduate studies at NTUA, where I was lucky to work with Dimitris Fotakis and Christos Tzamos.
My current research interests are:
- Multi-agent learning
- LLM Reasoning
- Causal Inference
Publications
Preprints and Working Papers
- The Conflict Graph Design: Estimating Causal Effects under Arbitrary Neighborhood Interference arXiv [BibTeX]
Peer-reviewed
-
Wait, Wait, Wait... Why Do Reasoning Models Loop?
Charilaos Pipis*, Shivam Garg*, Vasilis Kontonis, Vaishnavi Shrivastava, Akshay Krishnamurthy, Dimitris PapailiopoulosSpotlight ICML 2026 [BibTeX] [X thread]
- Efficient Learning and Computation of Linear Correlated Equilibrium in General Convex Games STOC 2025 [BibTeX] [Max's talk]
-
Polynomial-Time Computation of Exact Φ-Equilibria in Polyhedral Games
Gabriele Farina, Charilaos PipisSpotlight NeurIPS 2024 [BibTeX] [NeurIPS] [Gabriele's ACM SIGecom Exchanges article (pdf)]
-
Polynomial-Time Linear-Swap Regret Minimization in Imperfect-Information Sequential Games
Gabriele Farina, Charilaos PipisNeurIPS 2023 [BibTeX]
- Graph Connectivity with Noisy Queries MFCS 2023 [BibTeX]
Awards
- Onassis Foundation Scholarship
- Paris Kanellakis Fellowship
- Silver Medal in International Olympiad in Informatics (IOI) 2018
- Bronze Medal in International Olympiad in Informatics (IOI) 2017
- Silver Medal in Balkan Olympiad in Informatics (BOI) 2018
- Silver Medal in Balkan Olympiad in Informatics (BOI) 2017
- Bronze Medal in Balkan Olympiad in Informatics (BOI) 2016
Service
Reviewer: ICML 2026, STOC 2026, ICLR 2026, FOCS 2025, COLT 2025Workshop Reviewer: Reliable ML from Unreliable Data @ NeurIPS 2025