Former National Center for Computational Sciences Director James Hack Retires from 40-Year Computing Career

January 13, 2021

Jan. 13, 2021 — Delivering scientific breakthroughs on some of the world’s most powerful supercomputers requires leaders with the experience and knowledge of how to run the high-performance computing (HPC) centers that house them. That’s precisely why James Hack was hired in 2007—to direct the National Center for Computational Sciences (NCCS) at the US Department of Energy’s (DOE’s) Oak Ridge National Laboratory (ORNL).

At the time, Hack was already well-known for his expertise in computational climate science. He had previously spent 23 years at the National Center for Atmospheric Research (NCAR) working first as a senior scientist, then as a climate modeling section head, and finally as a deputy director at the Climate & Global Dynamics Division at NCAR. During his first few years at NCCS, he established the Oak Ridge Climate Change Science Institute (CCSI) to integrate climate activities across ORNL, setting a vision for the climate science areas across the laboratory with the goal of recruiting and developing strong leaders in the field.

Hack’s background as a computational climate scientist eventually drove his success as director of NCCS, where he set the Oak Ridge Leadership Computing Facility (OLCF) on a path to become a global force in scientific computing.

Last month, Hack retired from his 40-year career in computing and his 13-year career at the OLCF. During those 13 years, Hack saw the delivery of three Top500 computing systems: the Cray XT5 Jaguar, the Cray XK7 Titan, and the IBM AC922 Summit—the OLCF’s current flagship system and the fastest supercomputer in the nation. Despite his retirement, Hack’s leadership and the vision he founded for the OLCF will continue to benefit the center for years to come, including in the upcoming delivery and eventual scientific impact of the OLCF’s first exascale system, Frontier.

“Jim has been truly instrumental in driving the OLCF to where it is today,” said Barbara Helland, associate director of the DOE Office of Science’s Advanced Scientific Computing Research (ASCR) program. “Over the years, he kept the center’s morale up, fostered a strong connection with the Argonne Leadership Computing Facility [ALCF], and consistently delivered breakthrough scientific results aligned with the Office of Science’s mission.”

Jim Hack in the Exploratory Visualization Environment for Research in Science and Technology, or EVEREST. Image Credit: Jason Richards, ORNL.

A computational science pipeline

When Hack founded the CCSI at ORNL in 2009, he sought to recruit, grow, and enhance scientific contributions and research throughout ORNL and the DOE national laboratory complex for the field of climate. And although he had only been hired at ORNL 2 years prior, it was not the first time he had set out to establish a pipeline for growth and scientific advancement in the national laboratory space.

In fact, one of his first initiatives to equip the next generation of computational scientists began even before his tenure at ORNL, in 1991, when he helped found the DOE Computational Science Graduate Fellowship (CSGF). The CSGF has unique opportunities for PhD students using math and computers for their doctoral research. The program provides students with benefits such as a yearly stipend, paid tuition, and a 12-week practicum at one of the 21 DOE national laboratories or sites.

“Jim was one of the originators of the fellowship and has been a member of the CSGF steering committee since the program started,” said Judy Hill, a CSGF alumna and today the Section Head of Science Engagement at NCCS. In the past, Hill has credited the networking opportunities at CSGF for her original appointment at ORNL.

Helland, also one of the founders of CSGF, said, “He played an integral part in training the current generation of computational scientists.”

Setting science in motion with INCITE

One of Hack’s biggest contributions to the OLCF was in his stewardship of DOE’s Innovative and Novel Computational Impact on Theory and Experiment, or INCITE, program. The INCITE program awards time on the supercomputers at the OLCF and ALCF to researchers using HPC to solve “grand challenge” problems in science and engineering. The OLCF and ALCF are DOE Office of Science User Facilities located at ORNL and Argonne National Laboratory, respectively.

Throughout his time at the OLCF, Hack helped attract researchers to INCITE and improve the quality of both proposal reviewers and researchers in the program. He also kept the OLCF’s connection to ALCF and managed the centers’ joint INCITE call for proposals, viewing the success of the program as an ethical responsibility to the community.

As NCCS director, Hack led the INCITE allocation process each year, during which 11 National Academy–level panels determine which projects will receive allocations of computing time through INCITE.

Gina Tourassi was appointed director of NCCS at the end of 2019 as Hack transitioned to a strategic leadership role in CCSD for the remainder of his time at ORNL.

A vision for computing and beyond

Hack’s leadership of NCCS and contributions to the HPC community at ORNL ultimately transformed the center into the multiprogrammatic entity that it is today.

“When Jim came to ORNL in 2007, we were the OLCF. When he left, we were the OLCF, the US Air Force, the Compute and Data Environment for Science [CADES], and more,” said Ashley Barker, Section Head of Operations at NCCS. One of Hack’s first hires, Barker worked under him as the Group Leader of the OLCF’s previous User Assistance and Outreach Group for 11 years.

Aside from his professional accomplishments, Hack was a people person with vision for all-around success at the center.

“He cared about us—and not just as people who are delivering systems or supporting users,” Barker said. “If you engaged with him, he knew your children and your husband. He knew you as a person, and that really contributed to the health of the center overall.”

“Jim is one of those people that has enriched my life greatly,” Helland said. “He’s taught me many things, and he has forever changed the trajectory of computing in the DOE complex with the contributions he has made to students, staff, and the user community. I am grateful to have worked with him all these years.”

UT-Battelle LLC manages Oak Ridge National Laboratory for DOE’s Office of Science, the single largest supporter of basic research in the physical sciences in the United States. DOE’s Office of Science is working to address some of the most pressing challenges of our time. For more information, visit https://energy.gov/science.

Click here for the full article.


Source: Rachel McDowell, ORNL

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