Steven joined CASC as the Sidney Fernbach Postdoctoral Fellow in Fall of 2021 after completing his Ph.D. in Computer Science and Applications from Virginia Tech. His research interests include

• Ordinary differential equations and differential algebraic equations
• Multirate, implicit-explicit, and splitting methods for multiscale problems
• High-performance computing
• Stiff systems and order reduction
• Machine learning, model order reduction, and surrogate modeling

B.S. Mathematics, Virginia Tech, Blacksburg, VA

B.S. Computer Science, Virginia Tech, Blacksburg, VA

Ph.D. Computer Science and Applications, Virginia Tech, Blacksburg, VA

A full list of my publications can be found on Google Scholar. Select publications:

1. Balos, C. J., Roberts, S., & Gardner, D. J. (2023). Leveraging Mixed Precision in Exponential Time Integration Methods. In 2023 IEEE High Performance Extreme Computing Conference (HPEC) (pp. 1-8). IEEE. https://doi.org/10.1109/HPEC58863.2023.10363489 (Outstanding Paper Award)
    
2. Roberts, S., Popov, A. A., Sarshar, A., & Sandu, A. (2022). A Fast Time-Stepping Strategy for Dynamical Systems Equipped with a Surrogate Model. SIAM Journal on Scientific Computing, 44(3), A1405-A1427. https://doi.org/10.1137/20M1386281
    
3. Roberts, S. B. (2021). Multimethods for the Efficient Solution of Multiscale Differential Equations (Doctoral dissertation, Virginia Tech). https://hdl.handle.net/10919/104872
    
4. Roberts, S., Loffeld, J., Sarshar, A., Woodward, C. S., & Sandu, A. (2021). Implicit multirate GARK methods. Journal of Scientific Computing, 87(1), 1-32. https://doi.org/10.1007/s10915-020-01400-z
    
5. Roberts, S., Popov, A. A., & Sandu, A. (2019). ODE test problems: a MATLAB suite of initial value problems. arXiv preprint arXiv:1901.04098.

• Fall 2021 – Winter 2023: 2021 Fernbach Postdoctoral Fellow
• Fall 2018 – Spring 2020: Virginia Space Grant Consortium Graduate STEM Research Fellowship Recipient
• Fall 2017: Recipient of Virginia Tech Davenport Fellowship for research performance and promise
• 2016: Winner of Virginia Tech David Heilman Memorial Award for Outstanding Undergraduate Research

Personal Website

GitHub

Google Scholar

ORCID