Xuanfei Ren

Xuanfei Ren

PhD student in Computer Science

Welcome to Xuanfei Ren’s Homepage!

I am Xuanfei Ren (任宣霏), a PhD student in Computer Science at the University of Wisconsin-Madison, advised by Prof. Tengyang Xie. I completed my Bachelor of Science in Mathematics (specialization in Probability and Statistics) from the University of Science and Technology of China (USTC) in 2024.

I believe that with dedicated research efforts, the five years of PhD study can be highly productive and meaningful.

📄 Download my CV (PDF)

🔍 I'm actively seeking an internship starting from 2026 (spring/summer). Please feel free to reach out to me!

Research Interests

My current research interests span broadly across AI agents and reinforcement learning, encompassing both theoretical foundations and experimental work.

My recent project focuses on leveraging OpenTrace to optimize AI agents, in collaboration with Ching-An Cheng (Google Research) and Allen Nie (Google DeepMind). I am designing various efficient search algorithms to achieve optimal performance in agent optimization. This work is open-source, and I encourage everyone in the agent research community to explore and contribute!

Recent News

  • [2024/08] Started my PhD journey at University of Wisconsin-Madison, advised by Prof. Tengyang Xie.

  • [2024/05] Our paper “Optimal Batched Linear Bandits” gets accepted to ICML 2024. Joint work with Tianyuan Jin and Prof. Pan Xu.

Contact Me

If you are interested in discussing research or collaboration, or simply want to grab a coffee or chat, feel free to reach out. I always enjoy making new friends!