# Acknowledgements

#### Funding

Development of $\mathtt{grim}$ is funded by National Science Foundation grant 1333612.

#### People

• Ben Ryan
• Helped set up the test problems for the extended MHD model, most especially the static atmosphere test and the Bondi inflow test.
• Feedback on the design of $\mathtt{grim}$.
• Sasha Tchekhovskoy
• Contributed to setting up of numerical floors that prevented the code from breaking down in highly magnetized, low density regions.
• Matthew Turk
• Chris White
• Discussions on memory alignment and vectorization.
• Everyone in the Horizon collaboration