Scalable System Software. Biography I have a wide variety of research interests, mostly pertaining directly to data storage in supercomputing environments: Parallel and distributed storage systemsErasure coding and fault toleranceLow-level (block or object) storage devicesHeterogeneous computing (e.g., GPUs, accelerators) Education Ph.D. in Computer Science, University of Alabama at Birmingham, under...

# Staff Pages

## Mauro Perego

Scientific Machine Learning. Biography I'm interested in mathematical, numerical and computational treatment of Partial Differential Equations (PDE) that arise from various applications, PDE constrained optimization and recently in uncertainty quantification. My favorite numerical scheme for discretizing PDEs, and the one I'm mostly experienced with, is the Galerkin finite element method....

## Michael J. Levenhagen

Scalable System Software. Biography I work in the Scalable System Software department at Sandia National Laboratories. My primary interests are designing system software for capability class high performance computing platforms and enabling co-design activities for the laboratories by designing Structural Simulation Toolkit (SST) models of computer architectures. Publications

## Michael L. Parks

Computational Mathematics. Biography My current research interests include computational mathematics, numerical linear algebra, linear solvers, multiscale modeling, and peridynamics.Please see my professional webpage for more information. Professional Experience 2014-PresentManager, Computational Mathematics Dept.2013-2014Acting Manager, Computational Mathematics Dept.2013-2014Principal Member of the Technical Staff2007-2013Senior Member of the Technical Staff2004-2007Postdoctoral Employee Education 2005Ph.D., Computer...

## Michael P. Frank

Cognitive & Emerging Computing. Biography Hello, I'm currently (since Aug. 2015) a senior member of the technical staff at Sandia National Labs with a position designation of R&D S&E (Research & Development / Science & Engineering), Computer Science, with a primary appointment in the Cognitive & Emerging Computing department (1421)...

## Michael S. Eldred

Optimization & Uncertainty Quantification. Biography Mike led the DAKOTA project for 15 years (1994-2009) and now leads algorithm research activities that target new capabilities for DAKOTA. Mike's research interests include uncertainty quantification, design under uncertainty, multifidelity modeling, surrogate-based optimization, and high-performance computing, with application to stockpile stewardship and energy initiatives through NNSA and...

## Michael Wolf

Scalable Algorithms. Biography Michael Wolf is the manager of the Scalable Algorithms Department in the Center for Computing Research at Sandia National Laboratories. Education Ph.D., Computer Science (w/ CSE option), University of Illinois at Urbana-Champaign, 2009.B.S., Biology and Computer Science, Harvey Mudd College, 1998. Publications

## Nathaniel Albert Trask

Computational Mathematics. Biography I am a senior member of technical staff in the computational mathematics department in the Center for Computing Research at the Computer Science Research Institute at Sandia National Laboratories.My research focuses on structure preservation in scientific machine learning and novel meshfree discretizations for PDEs. I have a...

## Ojas Parekh

Discrete Math & Optimization. Biography I am a theoretical computer scientist who enjoys applying mathematical techniques to practically motivated interdisciplinary problems. I have worked in a variety of fields including discrete optimization, combinatorics, combinatorial scientific computing, and most recently, quantum and neuromorphic computing. A recent passion is helping shape the emerging fields...

## Paul Allen Kuberry

Computational Mathematics. Biography Paul Kuberry received his M.S. and Ph.D. in Mathematical Sciences from Clemson University and his B.S. in Mathematics from Clarion University of Pennsylvania. His research interests include developing and analyzing algorithms and coupling methods for the solution of multi-physics partial differential equations and problems posed on domains...

## Pavel B. Bochev

Computing Research. Biography Pavel is a Senior Scientist at Sandia National Laboratories in Albuquerque where he works in the Center for Computing Research. He joined Sandia in 2000 after six years of teaching and research at the University of Texas at Arlington. Pavel’s research interests include compatible discretizations for partial...

## Peter Andrew Bosler

Computational Science. Biography My research develops numerical methods and accompanying software for coupled multi physics problems. Most recently I have been working with projects in the climate modeling and plasma physics application areas. I have experience with vortex methods, Lagrangian particle methods, discontinuous Galerkin methods, and Lagrangian/semi-Lagrangian transport schemes. Education...

## Peter Brian Ohm

Computational Mathematics. Biography My research interests are in scientific and high performance computing with a focus on preconditioners for multiphysics PDE systems. Special interests include algebraic and geometric multigrid and block preconditioning. Education Ph.D., Mathematics - Tufts UniversityM.S., Mechanical Engineering - University of MinnesotaB.A., Mathematics and Physics - St. Olaf...

## Raymond Stephen Tuminaro

Computational Mathematics. Biography I'm interested in parallel iterative methods for linear systems, numerical linear algebra, eigenvalue problems, and parallel numerical software. Special interests in algebraic multigrid (e.g. smoothed aggregation), numerical solution of Maxwell's equations, incompressible Navier-Stokes, and block preconditioning. I have developed the Aztec iterative library as well as the...

## Richard B. Lehoucq

Discrete Math & Optimization. Biography I've worked on a myriad of projects over the course of my career. These include analysis of the peridynanmic nonlocal continuum theory, including mechanical and mathematical analyses.nonlocal diffusion equationdirected graphs and their statistical analysesthe numerical solution of large-scale eigenvalue problems and differential equations. I am...

## Robert John Baraldi

Optimization & Uncertainty Quantification. Biography Bobby's research interests include: algorithms for nonsmooth and nonconvex optimization, trust region algorithms, proximal algorithms, and PDE-constrained optimization. Bobby is also contributes to Rapid Optimization Library (ROL) and RegularizedOptimization package in Julia. Education Bobby earned his B.S. in Mathematics from North Carolina State University in...

## Roger P. Pawlowski

Computational Science. Biography Principal Member of the Technical Staff in the Computational Science Department at Sandia National Laboratories. 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 Physics applications including computational fluid dynamics, chemically reacting flows,...

## Ron A. Oldfield

Scientific Machine Learning. Biography I manage the Scalable Analysis & Visualization department at Sandia National Laboratories. I joined Sandia National Laboratories in 1992 as a student intern from the University of New Mexico. After getting my B.S. from UNM in 1993, I joined the Computational Sciences department at Sandia and...

## Ron Brightwell

Scalable System Software. Current Activities Track Co-Chair for Architecture, Networks/Communications, and Management, 2022 IEEE International Conference on Cluster ComputingTrack Chair for Architecture and Networks, 2023 International Conference on High Performance Computing in Asia-Pacific Region (HPC Asia) Bio I received my BS in mathematics in 1991 and my MS in computer science...

## Roscoe Bartlett

Software Engineering &Research. Biography Personal Webpage: https://bartlettroscoe.github.ioProfessional Interests: Agile Software Engineering and Integration Processes for Computational Science and Engineering (CSE)Software Engineering for Large-Scale NumericsAgile build and testing of CSE software Roscoe's reading list: https://bartlettroscoe.github.io/reading-list/ Education Carnegie Mellon University, Pittsburgh PA. Ph.D. in Chemical Engineering, 2001 University of Maryland Baltimore County....

## Scott A. Mitchell

Computational Mathematics. Biography I am currently doing technical work related to meshing, geometric modeling, and uncertainty. I'm currently working on robust meshing for ugly geometries, the Cubit project, and related components. Recently I've worked on the SGM geometric modeler for recovering CAD from meshes; discrete optimization of the number of edges on curves bounding...

## Scott Larson Nicoll Levy

Scalable System Software. Biography I am a Senior Member of Technical Staff in the Scalable System Software department of the Center for Computing Research (CCR). I research system software for next-generation extreme-scale systems. Specifically, I study the impact of system failures, and other sources of performance interference, on the execution...

## Stephen D. Bond

Computational Mathematics. Biography I am a senior member of the technical staff in the Computational Mathematics group within the Center for Computing Research and Computer Science Research Institute at Sandia National Laboratories. My research interests include: Numerical analysis Statistical mechanics Computational chemistry Geometric integration Biomolecular modeling Multilevel preconditioning Adaptive finite elements Molecular dynamics Continuum...

## Stephen Lecler Olivier

Scalable System Software. Biography My research focuses on run time systems and programming models for high performance computing, including issues in productivity, scalability, and power. Much of my work concerns support for efficient multithreading on the supercomputer node level, especially through the task-parallel programming model. I enjoy working with application...

## Steven J. Plimpton

Computational Multiscale. Biography My research involves implementing and using scientific simulations designed for parallel supercomputers, which often requires creation of efficient parallel algorithms. Many of the models are particle based, some use structured grids or finite elements. Most of the codes I develop are for materials modeling, some for biology...

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