I am a Distinguished Scientist in the Scientific Computing and Theoretical Physics Groups at Oak Ridge National Laboratory and I currently serve as the Director of Science for the Oak Ridge Leadership Computing Facility. I am also a Joint Faculty Professor in the Department of Physics & Astronomy at the University of Tennessee.
I have spent a lot of time learning about, using, helping to build, programming, and otherwise finding excuses to be around many of the world’s biggest computers over the past 25 years or so. A lot of this effort has been dedicated to using these machines to study the death of stars and the formation of compact objects like neutron stars and black holes.
Member – American Physical Society Committee on Informing the Public (2018–2020)
Technical Papers Committee – ACM/IEEE Supercomputing Conference (SC16, SC17, SC18, SC19)
Co-Chair – Nuclear Astrophysics, ASCR-NP Exascale Requirements Review (2016)
Working Group Organizer – Astrophysics Theory and Computing, Division of Nuclear Physics Town Meeting on Nuclear Astrophysics (2014)
PhD in Physics, 2000
University of Tennessee
BS in Physics, 1991
University of Tennessee
ExaStar is a collaboration between Berkeley Lab, Oak Ridge Lab, Argonne Lab, and Stony Brook University, and is an application development project within the DOE Exascale Computing Project.
CHIMERA is our multi-dimensional core-collapse supernova code, capable of tracking the evolution of these systems from the pre-collapse stellar stage to up to a second of evolution time after the core bounce.
Toward Exascale Astrophysics of Mergers and Supernovae: This SciDAC project aims to study the sites of R-process nucleosynthesis using realistic simualtions of core-collapse supernovae and neutron star mergers.
A collaborative effort of application development teams and staff from the OLCF Scientific Computing group, CAAR is focused on redesigning, porting, and optimizing application codes for Frontier’s hybrid CPU–GPU architecture.