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# Acknowledgments

The Sierra/SD software package is the collective effort of many individuals and teams. A core Sandia National Laboratories based Sierra/SD development team is responsible for maintenance of documentation, testing, and support of code capabilities. This team includes Dagny Beale, Gregory Bunting, Nate Crane, David Day, Clark Dohrmann, Payton Lindsay, Justin Pepe, Julia Plews, Jesse Thomas, Ben Treweek, and Johnathan Vo.

The Sierra/SD team also works closely with the Sierra FuSED and Plato teams to jointly enhance and maintain several capabilities. This includes contributions from Wilkins Aquino, Sean Hardesty, Elizabeth Livingston, Chandler Smith, Timothy Walsh, and Ray Wildman.

The Sierra/SD team works closely with other Sierra teams on core libraries and shared tools. This includes the DevOps, Sierra Toolkit, Solid Mechanics, Fluid Thermal Teams. Additionally, analysts regularly provide code capabilities as well as help review and verify code capabilities, testing, and documentation. Other individuals not already mentioned directly contributing to the Sierra/SD documentation, testing, and code base during the last year include Victor Brunini, Jonathan Clausen, David Glaze, Mark Hamilton, Andrew Kimler, Dong Lee, Kevin Manktelow, Mark Merewether, Scott Miller, Matthew Mosby, Tony Nguyen, Tolu Okusanya, Heather Pacella, Kendall Pierson, Nick Reynolds, Timothy Shelton, John Shimanek, Greg Sjaardema, Clinton Stimpson, Tyler Voskuilen, Ellen Wagman, Alan Williams, and Christopher Wilson.

Historically dozens of other Sandia staff, students, and external collaborators have also contributed to the Sierra/SD product and its documentation.

Many other individuals groups have contributed either directly or indirectly to the success of the Sierra/SD product. These include but are not limited to;

- Garth Reese implemented the original Sierra/SD code base. He served as principal investigator and product owner for Sierra/SD for over twenty years. His efforts and contributions led to much of the current success of .

- Clark Dohrmann who developed the GDSW solver that is vital for parallel and GPU performance of Sierra/SD.

- David Day who directly supported Sierra/SD development work for over twenty years.

- The ASC program at the DOE which funded the initial Sierra/SD (Salinas) development as well as the ASC program which still provides the bulk of ongoing development support.

- Line managers at Sandia Labs who supported this effort. Special recognition is extended to David Martinez who helped establish the effort.

- Charbel Farhat and the University of Colorado at Boulder. They have provided incredible support in the area of finite elements, and especially in development of linear solvers.

- Carlos Felippa of U. Colorado at Boulder. His consultation has been invaluable, and includes the summer of 2001 where he visited at Sandia and developed the Hexshell element for us.

- Danny Sorensen, Rich Lehoucq and other developers of ARPACK, which is used for eigenvalue problems.

- Esmond Ng who wrote sparspak for us. This sparse solver package is responsible for much of the performance in Sierra/SD linear solvers.

- The metis team at the University of Minnesota. Metis is an important part of the graph partitioning schemes used by several of our linear solvers. These are copyright 1997 from the University of Minnesota.

- Padma Raghaven for development of a parallel direct solver that is a part of the linear solvers.

- The developers of the SuperLU Dist parallel sparse direct linear solver. It is used through GDSW for a variety of problems.

- Leszek Demkowicz at the University of Texas at Austin who provided the HP3D [FKDN15] library and has worked with the Sierra/SD team on several initiatives. The HP3D library is used to calculate shape functions for higher order elements.

This work was supported by the Laboratory Directed Research and Development (LDRD) program.