James R. Stewart

Computing Research

Author profile picture

Computing Research


(505) 844-8630

Sandia National Laboratories, New Mexico
P.O. Box 5800
Albuquerque, NM 87185-1318


Since March 2022, Jim has served as the Acting Director of Sandia’s Center for Computing Research. From 2017-2022, he served as the Senior Manager of the Computational Sciences and Math Group, and previously served as Manager of the Optimization and Uncertainty Quantification Department and the Advanced Computational Mechanics Architectures Department. Jim is Sandia’s lead for the DOE Office of Science Advanced Scientific Computing Research (ASCR) program, which includes programmatic responsibility for Sandia’s Exascale Computing Project (ECP). He also leads Sandia’s Advanced Technology Development and Mitigation (ATDM) subprogram, which is part of DOE’s Advanced Simulation and Computing (ASC) program for stockpile stewardship. He has led major software development teams including the Dakota optimization and uncertainty quantification toolkit team, as well as the SIERRA computational mechanics framework team. 


Jim holds a Ph.D. in Mechanical Engineering from Stanford University and B.S. and M.S. degrees in Mechanical Engineering from the University of Illinois at Urbana-Champaign. He has previous experience at NASA Langley Research Center and joined Sandia after a short stint at Object Reservoir, Inc., a start-up company in Austin, TX focused on reservoir modeling. He has served on the Executive Council of the U.S. Association for Computational Mechanics (USACM) and chaired the USACM Technical Thrust Area on Uncertainty Quantification & Probabilistic Modeling from 2015-2020. Jim was named USACM Fellow in 2021.


James R. Stewart, (2022). Sandia Computing & Information Science: Introduction & Overview CSRI Summer Seminar Series Document ID: 1551002

James R. Stewart, (2021). Data-Driven Modeling and the Big Data Problems Mechanistic Machine Learning and Digital Twins for Computational Science, Engineering & Technology (MMLDT-CSET) Document ID: 1367672

James R. Stewart, (2020). Meeting the Challenges of Modeling and Simulation at Exascale 16th U.S. National Congress on Computational Mechanics Document ID: 1196546

James R. Stewart, (2019). Sandia National Laboratories Five Most Impactful ASCR Research Investments ASCR Reverse Site Visit https://www.osti.gov/search/identifier:1645453 Document ID: 974356

James R. Stewart, (2019). Optimization Under Uncertainty for Design, Materials, and Large-Scale Computing Invited SeminarNorthwestern University Predictive Science & Engineering Design Cluster https://www.osti.gov/search/identifier:1644485 Document ID: 935837

James R. Stewart, (2019). Optimization Under Uncertainty for Predicting Properties and Performance Workshop on Uncertainty Quantification in Computational Solid and Structural Materials Modeling https://www.osti.gov/search/identifier:1592585 Document ID: 902219

James R. Stewart, (2018). SNL ATDM Overview: Focused on SNL?s Exascale Mission Drivers — Abstract Nuclear Explosives Code Development Conference Document ID: 876452

James R. Stewart, (2018). Sandia’s Exascale Computing Project Sandia National Laboratories — Westinghouse Electric Co. https://www.osti.gov/search/identifier:1592313 Document ID: 865615

James R. Stewart, (2018). Computational Sciences and Math at Sandia — Algorithms, Software, and Applications 13th World Congress on Computational Mechanics https://www.osti.gov/search/identifier:1806533 Document ID: 831307

James R. Stewart, (2018). Computational Mechanics R&D Opportunities at Sandia 13th World Congress on Computational Mechanics https://www.osti.gov/search/identifier:1806532 Document ID: 831196

William J. Rider, Micah Andrew Howard, Matthew Tyler Bettencourt, Micheal W. Glass, James R. Stewart, (2018). Sandia?s ATDM Application Codes Necdc 2018 Document ID: 808687

Francesco NMN Rizzi, Eric T. Phipps, David S Hollman, Jonathan Josiah Lifflander, Jeremiah J Wilke, Aram Markosyan, Hemanth Kolla, Nicole Slattengren, Keita Teranishi, James R. Stewart, Robert L. Clay, Janine Camille Bennett, (2017). Tackling UQ in DARMA, a Programming Model for Task-Based Execution at Extreme-Scale Quiet17 https://www.osti.gov/search/identifier:1507896 Document ID: 638444

James R. Stewart, (2017). Usacm Thematic Workshop On Uncertainty Quantification And Data-driven Modeling https://www.osti.gov/search/identifier:1367419 Document ID: 623481

James R. Stewart, (2016). Science-Based Computational Modeling: New Questions, New Challenges, and Big Data Problems Michigan Institute for Computational Discovery & Engineering Seminar Series https://www.osti.gov/search/identifier:1618233 Document ID: 430265

Allen C. Robinson, Otto Erik Strack, William J. Rider, John Walter, Kristi Brislawn, Edward Love, Thomas E. Voth, Stewart John Mosso, John Henry Judah Niederhaus, Sharon Petney, Richard R. Drake, V. Gregory Weirs, Brian M. Adams, Dena Vigil, John H. Carpenter, Christopher J. Garasi, Michael K. Wong, Joshua Robbins, Christopher Siefert, Ann Elisabet Wills, Susan carroll, Duane LaBreche, Chris Kueny, Chris Luchini, Timothy G. Trucano, Pavel B. Bochev, Randall M. Summers, James R. Stewart, Curtis C. Ober, Thomas A. Haill, Raymond W. Lemke, Kyle Cochrane, Michael P. Desjarlais, (2013). ALEGRA Update: Modernization and Resilience Progress Multimat2013 https://www.osti.gov/search/identifier:1115141 Document ID: 5327018

Jeffrey A. Mahn, James R. Stewart, Eugene S. Hertel, Harold C. Edwards, (2007). Copy of Multiphase Flow Target (MFT) Two-way Coupling of CTH and Presto Interface Control Document https://www.osti.gov/search/identifier:1115141 Document ID: 5250476

Donald F. Susan, James R. Stewart, (2006). Solution Verification and Uncertainty Quantification Coupled https://www.osti.gov/search/identifier:1724649 Document ID: 5247077

Steven J. Plimpton, Bruce A. Hendrickson, James R. Stewart, (2002). A Parallel Rendezvous Algorithm for Interpolation Between Multiple Grids Supercomputing ’98 (date November 1998) https://www.osti.gov/search/identifier:1724649 Document ID: 4508700

Steven J. Plimpton, Bruce A. Hendrickson, James R. Stewart, (2002). A Parallel Rendezvous Algorithm for Interpolation Between Multiple Grids Journal of Parallel and Distributed Computing https://www.osti.gov/search/identifier:1724649 Document ID: 4391200

Hillary Minich Armstrong, James R. Stewart, John D. Zepper, (2002). Mathematical Abstractions of the SIERRA Computational Mechanics Framework 5th World Congress on Computational Mechanics https://www.osti.gov/search/identifier:1724649 Document ID: 4317500

Hillary Minich Armstrong, James R. Stewart, (2001). The SIERRA Computational Mechanics Framework Sixth U. S. National Congress on Computational Mechanics https://www.osti.gov/search/identifier:1724649 Document ID: 4017200

David E. Womble, Scott A. Mitchell, James R. Stewart, John N. Shadid, Michael S. Eldred, (2001). Review oc ASCI Algorithms at Sandia https://www.osti.gov/search/identifier:1724649 Document ID: 3855600

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