About Me
I joined the Department of Mathematics at the University of Kentucky as an Assistant Professor in 2024. Before that, I was a postdoc in the Department of Statistics and Actuarial Science at the University of Waterloo (2023–2024) and previously worked as a Quantitative Analyst at Wells Fargo (2022–2023). I received my B.S. from Sichuan University (2012-2016) and Ph.D. in Mathematics from the University of Utah (2017-2022). Both Chengdu and Salt Lake City hold many sweet memories from my early adulthood.
My research interests lie in the mathematics of data. Specifically, I work on ranking, randomized approximation, and multifidelity methods. I am supported in part by NSF grant no. DMS-2607989.
Selected Work
- Tom Alberts, Yiming Xu, Qiang Ye, Joint stochastic localization and applications, arxiv (2025)
- Ben Adcock, Bernhard Hientzsch, Akil Narayan, Yiming Xu, Hybrid least squares for learning functions from highly noisy data, SIAM Journal on Mathematics of Data Science (to appear)
- Pinjun Dong, Ruijian Han, Binyan Jiang, Yiming Xu, Statistical ranking with dynamic covariates, Journal of the Royal Statistical Society: Series B (2026)
- Ruijian Han, Yiming Xu, A unified analysis of likelihood-based estimators in the Plackett-Luce model, The Annals of Statistics (2025)
- Ruijian Han, Boris Kramer, Dongjin Lee, Akil Narayan, Yiming Xu, An approximate control variates approach to multifidelity distribution estimation, SIAM/ASA J. Uncertain. Quantif. (2024)
Teaching
- MA 416 - Introduction to Optimization (Fall 2026)
- MA 213 - Calculus III (Fall 2026)
- MA 420 - Intro to Stochastic Processes (Spring 2026)
- CS/MA 522 - Matrix Theory and Numeric Linear Algebra (Fall 2025)
- MA 323 - Math Intro to Data Science (Fall 2025)
- MA/STA 417 - Decision Making Under Uncertainty (Spring 2025)
- CS/MA 321 - Introduction to Numerical Methods (Fall 2024)
- Math 1070 - Introduction to Statistical Inference (Fall 2019, Spring 2020)
- Math 1220 - Calculus II (Summer 2019)
- Math 1100 - Business Calculus (Fall 2018, Spring 2019)