I am a final-year PhD student in the Department of Operations Research and Financial Engineering at Princeton University, advised by Professor Jianqing Fan. Before Princeton, I received my bachelor’s degree from the School of Mathematical Sciences at Peking University, with a double major in Economics.

My research develops statistical foundations for learning and decision-making in high-dimensional and heterogeneous environments, with applications to transfer learning, reinforcement learning, dynamic pricing, and LLM alignment.

I am generally interested in:

• High-dimensional statistics
• Statistical decision-making, reinforcement learning and dynamic pricing
• Transfer learning and data integration
• LLM alignment

Email: jhchai [at] princeton [dot] edu

Outside research, I enjoy tennis, badminton, rock climbing, and basketball. Feel free to reach out if you want to chat about research or other topics!