Manager, Software Engineering & Research. Biography My research priority is to manage the data volume from scientific simulations to accelerate the scientific discovery process. To accomplish these goals, I work on issues related to managing the data created by simulations to the IO stack including the parallel file system and...

# Staff Pages

## Graham Bennett Harper

Computational Mathematics. Biography Graham's primary interests are fluid problems, finite element discretizations, multiscale, and multigrid methods. Education PhD in Mathematics - Colorado State UniversityAdvisor: James LiuCommittee: Wolfgang Bangerth, Stephen Guzik, Simon Tavener, Yongcheng ZhouBS in Mathematics - Colorado State University-PuebloMinors: Industrial Engineering, Honors, Leadership Studies Publications

## James Aimone

Cognitive & Emerging Computing. Biography Dr. Brad Aimone is a Distinguished Member of Technical Staff in the Center for Computing Research at Sandia National Laboratories, where he is a lead researcher in leveraging computational neuroscience to advance artificial intelligence and in using neuromorphic computing platforms for future scientific computing applications....

## James Brian Carleton

Computational Multiphysics. Biography I am a Senior Member of Technical Staff in the Computational Multiphysics Department. I work in both analyst and developer roles on the ALEGRA team.My background is in computational solid mechanics, and my main areas of interest center around computational modeling of multiphysics and multiscale systems and...

## James G. Foucar

Software Engineering & Research. Biography I am currently an employee of Sandia National Labs working as a software developer. I have a wide variety of experience in the computing field: I’ve spent time in academia, I’ve worked for many years as an intern at Sandia, and I’ve worked as a...

## James H. Laros

Scalable Computer Architecture. Biography James H. Laros III is a Distinguished Member of Technical staff at Sandia National Laboratories. Over his more than 30-year career to date, James has served the United States of America in a number of capacities beginning with four years active duty in the United States...

## James R. Stewart

Computing Research. Biography 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...

## Jennifer Ann Loe

Scalable Algorithms. Biography Jennifer Loe is a Senior Member of Technical Staff at Sandia National Laboratories. She completed her Ph.D. in mathematics at Baylor University in December 2019. In January 2020, she became a postdoc in the Scalable Algorithms department at Sandia and converted to full staff in February 2022. ...

## John A. Mitchell

Computational Multiscale. Brief Research and Project History Nonlinear solver algorithms and implementations for solid mechanicsEngineering project managementTechnology maturation and assessmentConstitutive model development (particularly Peridynamics)GPU programmingInverse problemsMonte Carlo models for grain growth in metalsData analytics applied to metal material microstructures, insitu pyrometry dataMicrostructure effects on dynamic response of additively manufactured metals...

## John Adam Stephens

Optimization & Uncertainty Quantification. Biography Adam joined Sandia in 2013 as a senior member of technical staff. He currently works primarily as a developer of Dakota (https://dakota.sandia.gov) and leads the Dakota Mission Integration thrust, which is charged with bridging the gap between upstream R&D and ordinary Dakota users. Adam's research...

## John Daniel Siirola

Discrete Math & Optimization. Biography John Siirola is a Principal R&D Member of Technical Staff in the Discrete Math & Optimization Department at Sandia National Laboratories. His main areas of expertise are systems design, operations research, optimization modeling, and optimization algorithms. John’s research focuses on the intersection of computational tools...

## John Davis Jakeman

Optimization & Uncertainty Quantification. Biography I specialize in developing and utilizing machine learning methods for credible data-informed decision making. My experience lies in the intersection of mathematics, statistics and computer science. I am the founding developer of PyApprox which is a Python toolbox for machine learning, uncertainty quantification and design...

## John Henry Judah Niederhaus

Computational Multiphysics. Biography Modeling and simulation research background: High-velocity and hyper-velocity impact.Pulsed power systems.Explosives.Exploding wires and spark discharges.Magnetohydrodynamics.Gas dynamics and shock-accelerated flows. Education 2007 University of Wisconsin-Madison, Engineering Physics - PhD2003 Pennsylvania State University, Nuclear Engineering - MS2001 Virginia Military Institute, Physics - BS Publications

## John N. Shadid

Computational Mathematics. Biography I am a Distinguished Member of the Technical Staff in the Computational Mathematics Department at Sandia National Laboratories. My research interests include: high performance computing, and parallel algorithm development,numerical methods for multiple-time-scale nonlinear coupled PDEs,temporal and spatial discretizations of PDEs,scalable preconditioners for multiphysics PDE systems, withapplications to computational...

## Jonathan J. Hu

Scalable Algorithms. Biography I am a Principal Member of the Technical Staff in the Scalable Algorithms Department at Sandia National Labs. My interests include scalable solution methods for linear systems, such as multigrid methods, preconditioning techniques for problems arising from uncertainty quantification, and solvers for advanced architectures. I am a...

## Jonathan W. Berry

Discrete Math & Optimization. Biography Jonathan Berry is a Distinguished Member of the Technical Staff at Sandia National Laboratories. He holds a Ph.D. in computer science from Rensselaer Polytechnic Institute and spent almost a decade in liberal arts academia before joining Sandia in 2004. He has led a variety of...

## Joseph Lee Hart

Scientific Machine Learning. Biography Joseph is interested in quantifying, prioritzing, and mitigating uncertainty in large-scale optimization problems constrained by differential equations. His research spans numerical optimization, sensitivity analysis, inverse problems, optimal experimental design, and scientific machine learning in the service of outer loop analysis. Joseph focuses on finding and exploiting...

## Joshua Rackers

Computational Multiscale. Biography I am interested in predicting how molecules move and interact at the atomic scale. In particular, I research methods for producing quantum-accurate potential energy surfaces for biological molecules. The tools I build for this purpose draw on the fields of chemical physics, quantum chemistry, statistical physics, and...

## Kara J. Peterson

Computational Mathematics. Biography I am currently a principal member of the technical staff in the Computational Mathematics Department. My research interests include: Finite element method and compatible discretizations. Stabilization methods for advection-dominated flows. Optimization-based property-preserving transport schemes. Sea ice modeling with the material-point method and an elastic-decohesive rheology. Education Ph.D....

## Kenneth Michael Rudinger

Quantum Computer Science. Biography I'm a staff member in Organization 1425, working in the field of quantum information and quantum computing. Current work of mine focuses predominately on optimizing tomography of quantum information processors, using a framework developed here at Sandia known as gate set tomography. I also study quantum...

## Kevin Pedretti

Scalable System Software. Biography Kevin Pedretti is a Principal Member of Technical Staff at Sandia National Laboratories. He has helped develop several large-scale parallel computers, including the Red Storm system that was productized as the Cray XT line of supercomputers and Astra, the first Petascale supercomputer based on Arm processors....

## Kurt Brian Ferreira

Scalable System Software. Biography Principal Member of Technical Staff My area of expertise is system software and resilience/fault-tolerance methods for large-scale, massively parallel, distributed-memory, scientific computing systems. I have designed and developed a number of innovative, high-performance, and resilient implementations of low-level system software for several HPC platforms including the Cray...

## Laura Painton Swiler

Computing Research. Biography Laura has worked at Sandia since 1995. She is currently a distinguished member of technical staff in the optimization and uncertainty quantification department. Laura's research interests include uncertainty quantification for computational models, calibration of model parameters, sensitivity analysis, and model selection. Laura is a developer on the...

## Mark Alan Taylor

Computational Science. Biography Mark Taylor is a mathematician who specializes in numerical methods for parallel computing and geophysical flows. He currently serves as Chief Computational Scientist for the DOE's Energy Exascale Earth System Model (E3SM) project. He developed the Hamiltonian structure preserving formulation of the spectral element method used in...

## Mark Daniel Rintoul

Machine Intelligence and Vis. Biography I work primarily in the area of using high-performance computing and advanced mathematical modeling techniques to solve complex real-world problems. The application areas that I have worked in include material science, biology, computational geometry, and various national defense areas. Education B.S. Caltech (Physics, 1989), Ph.D....

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