About Me
I am a Senior Research Scientist at Google. I obtained my PhD from University of Southern California (USC), advised by Prof. Xiang Ren. I obtained my B.Eng. from Tsinghua University, advised by Prof. Zhiyuan Liu.
I work on improving agentic capabilities and trustworthiness of Large Language Models (LLMs).
Selected Publications
(* indicates equal contribution)
ReasoningBank: Scaling Agent Self-Evolving with Reasoning Memory
Supervised Reinforcement Learning: From Expert Trajectories to Step-wise Reasoning
Yihe Deng, I-Hung Hsu, Jun Yan, Zifeng Wang, Rujun Han, Gufeng Zhang, Yanfei Chen, Wei Wang, Tomas Pfister, Chen-Yu Lee
ICLR 2026 [paper]
Gemini 2.5: Pushing the Frontier with Advanced Reasoning, Multimodality, Long Context, and Next Generation Agentic Capabilities
Gemini Team, Google
Technical Report, 2025 [paper]
In Prospect and Retrospect: Reflective Memory Management for Long-term Personalized Dialogue Agents
Zhen Tan, Jun Yan, I-Hung Hsu, Rujun Han, Zifeng Wang, Long T. Le, Yiwen Song, Yanfei Chen, Hamid Palangi, George Lee, Anand Iyer, Tianlong Chen, Huan Liu, Chen-Yu Lee, Tomas Pfister
ACL 2025 [paper]
Backdooring Instruction-Tuned Large Language Models with Virtual Prompt Injection
Jun Yan, Vikas Yadav*, Shiyang Li*, Lichang Chen, Zheng Tang, Hai Wang, Vijay Srinivasan, Xiang Ren, Hongxia Jin
NAACL 2024 [paper] [project page]
AlpaGasus: Training A Better Alpaca with Fewer Data
Lichang Chen*, Shiyang Li*, Jun Yan, Hai Wang, Kalpa Gunaratna, Vikas Yadav, Zheng Tang, Vijay Srinivasan, Tianyi Zhou, Heng Huang, Hongxia Jin
ICLR 2024 [paper] [project page]
Education
University of Southern California
Ph.D. in Computer Science
2019 - 2024 Los Angeles, CA, U.S.
Tsinghua University
B.Eng. in Electronic Engineering
2015 - 2019 Beijing, China