I am a tenure-track Assistant Professor at UC Berkeley. I am interested in number theory and its connections to algebraic geometry, representation theory, and algebraic topology.
I am also working on Machine Learning, currently as a Visiting Researcher at Google DeepMind. In the past, I worked with xAI on Grok 2 and Grok 3.
My CV is available.
I am co-PI of the Berkeley RTG on Numbers, Symmetry, and Geometry (along with David Nadler, Martin Olsson, Sug Woo Shin, and Yunqing Tang).
E-mail: fengt[aat]berkeley[doot]edu.
News: (updated Mar 28, 2025)
- Information for Math 116: Cryptography can be found here.
- Information for Math 274: Topics in Algebra can be found here.
- Uploaded a revision to Mirror symmetry and the Breuil-Mezard Conjecture (with Bao Le Hung), which contains some significant corrections.
- Uploaded a draft of a survey joint with Michael Harris, Derived structures in the Langlands Correspondence, written for the Proceedings of the 2022 (yikes!) IHES Summer School. We welcome comments and corrections for the final draft.
- This result (joint with GD, AK, and LZ) demonstrates that low-skilled agents with sufficient compute can overcome the number 1 ranked professional in AoE2.
- Uploaded a new paper, joint with Adeel Khan, Modularity of higher theta series II: Chow group of the generic fiber.
- Uploaded a new paper, joint with Jonathan Wang, Geometric Langlands duality for periods.
- Uploaded a new paper, Modular functoriality in the Local Langlands Correspondence.
- Uploaded a new paper joint with Zhiwei Yun and Wei Zhang, Modularity of higher theta series I: cohomology of the generic fiber.
Short Vita:
- Assistant Professor, UC Berkeley 2022-Present
- Viterbi Postdoctoral Fellow, MSRI/SLMath 2023
- C L E Moore Instructor and NSF Postdoctoral Fellow, MIT 2019-2022 (Sponsor: Wei Zhang)
- Member, Institute for Advanced Study 2020-2021
- Ph.D., Stanford University 2019 (Advisor: Akshay Venkatesh)
- MASt, Cambridge University 2014 (Part III)
- A.B.+A.M., Harvard University 2013 (Mathematics concentration, Computer Science secondary)