Behind every great organization is a team with a vision. Meet the key decision-makers who are leading the one of nation’s top high performance computing centers.
The Team Behind the Vision
NCCS Org Chart (Updated Oct 2025) Download
Arjun Shankar
NCCS Division Director and OLCF Director
Ashley Barker
OLCF Program Director
Matt Sieger
OLCF-6 Project Director
Bronson Messer
OLCF Director of Science
Jim Rogers
Director, Computing and Facilities
Kevin Thach
Section Head, Systems
Verónica Melesse Vergara
Section Head, Operations
Tom Beck
Section Head, Science Engagement
Sarp Oral
Section Head, Advanced Technologies
Dustin Leverman
OLCF-6 Deputy Director
T. P. Straatsma
Distinguished Research Scientist
Paul Abston
Data Center Manager and Safety Officer
Tom Bundy
Quality Assurance Manager
Rachel Clauss
Human Resources Business Partner
Joe Lake
Strategic Programs Manager
David Langley
Finance Officer
Jessica Sampsel
Finance Officer
Suzy Tichenor
Director, Industrial Partnerships
Linda Weltman
Division Administrative Assistant
Kevin Thach
Section Head, Systems
Paul Abston
Group Leader, HPC Infrastructure Operations
Ryan Adamson
Group Leader, HPC Cyber Security & Information Engineering
Elton Cranfill
Group Leader, HPC Clusters
Travis Croxdale
Group Leader, HPC Networking
Jesse Hanley
Acting Group Leader, HPC Storage & Archive
Kevin Masteller
Acting Group Leader, HPC Infrastructure
Don Maxwell
Group Leader, HPC Scalable Systems
Zach Mayes
Acting Group Leader, HPC Platforms
Stephanie Berlin
Administrative Assistant
Sherry Chandler
Administrative Assistant
Verónica Melesse Vergara
Section Head, Operations
Katie Bethea
Group Leader, User Access, Outreach, & Communications
Chris Fuson
Group Leader, User Assistance
Fernando Posada
Group Leader, System Acceptance & User Environment
Sonya Mowery
Administrative Assistant
Tom Beck
Section Head, Science Engagement
Reuben Budiardja
Group Leader, Advanced Computing for Nuclear, Particles, & Astrophysics
Matt Norman
Group Leader, Advanced Computing for Life Science & Engineering
Phil Roth
Group Leader, Algorithms & Performance Analysis
Dmytro Bykov
Group Leader, Advanced Computing for Chemistry & Materials
Maria White
Administrative Assistant
Myranda White
Administrative Assistant
Sarp Oral
Section Head, Advanced Technologies
Rafael Ferreira da Silva
Group Leader, Workflows and Ecosystem Services
Feiyi Wang
Group Leader, Analytics and AI Methods at Scale
Chris Zimmer
Group Leader (Interim), Technology Integration
Ashley Guge
Administrative Assistant
Jessica Whitt
Administrative Assistant