I am currently a third year Ph.D. student at Princeton University, and I am fortunate to be advised by Prof. Sanjeev Arora.

I completed my undergraduate at Andrew Chi-Chih Yao’s CS pilot class at Tsinghua University, where I am advised by Prof. Wei Chen. Previously, I am also a reserach intern at Microsoft Research Asia Theory group and my mentor is Prof. Wei Chen. In my junior year, I also visited Duke University where I had a great time working with Prof. Rong Ge.

Research Interests

I am broadly interested in theoretical machine learning. Some particular interests include theory for natual language processing, deep learning theory, theory of optimization and federated learning, online algorithms and online leraning.


  • [Oct. 2023] One paper gets accepted at EMNLP 2023!
  • [Apr. 2023] One paper gets accepted at ICML 2023!
  • [Mar. 2023] New paper out: Do Transformers Parse while Predicting the Masked Word?
  • [Feb. 2023] New paper out: Task-Specific Skill Localization in Fine-tuned Language Models.

Contact Information

haoyu AT princeton DOT edu

zhaohy16 AT mail DOT tsinghua DOT org DOT cn

thomaszhao1998 AT gmail DOT com