Hello!

I'm an NSF Postdoc in the math department at UC Berkeley, working broadly in numerical analysis, (randomized) numerical linear algebra, and scientific computing. My mentor is James Demmel.

Before moving to Berkeley, I completed a Ph.D. in mathematics at UC San Diego, where my advisor was Ioana Dumitriu. I was also a Measurement Science and Engineering Fellow in the Applied and Computational Math Division of NIST, working primarily with Barry Schneider. In 2018 I completed a B.A. in mathematics at Washington University in St. Louis.

My CV is available here. My preferred pronouns are he/him. 🏳️‍🌈

Publications

Preprints:

James Demmel, Hengrui Luo, R.S., and Yifu Wang. Minimizing the Arithmetic and Communication Complexity of Jacobi's Method for Eigenvalues and Singular Values (2025). [arXiv] [code]
James Demmel, Ioana Dumitriu, and R.S. Structured Divide-and-Conquer for the Definite Generalized Eigenvalue Problem (2025). [arXiv]
James Demmel, Ioana Dumitriu, and R.S. Fast and Inverse-Free Algorithms for Deflating Subspaces (2024). [arXiv]

Journal Papers:

James Demmel, Ioana Dumitriu, and R.S. Generalized Pseudospectral Shattering and Inverse-Free Matrix Pencil Diagonalization. Foundations of Computational Mathematics (2024). [journal] [arXiv] [code]
R.S., Heman Gharibnejad, and Barry I. Schneider. ITVOLT: An Iterative Solver for the Time-Dependent Schrödinger Equation. Computer Physics Communications Vol. 291 (2023). [journal] [arXiv] [code]

Theses:

PhD Thesis: Pseudospectral Divide-and-Conquer for the Generalized Eigenvalue Problem. Supervised by Ioana Dumitriu (2024). [pdf]
Undergraduate Honors Thesis: Hecke Algebra Characters Evaluated at Kazhdan-Lusztig Basis Elements Give the Betti Numbers of Hessenberg Varieties. Supervised by John Shareshian (2018). Manuscript available upon request. [abstract]

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