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The Team Behind the Vision

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.

NCCS Org Chart (Updated Oct 2025) Download

Portrait of Arjun Shankar in suit and blue shirt.

Arjun Shankar

NCCS Division Director and OLCF Director

Ashley Barker

OLCF Program Director

Person in grey suit in front of blue background

Matt Sieger

OLCF-6 Project Director

Bronson Messer

OLCF Director of Science

Jim Rogers

Director, Computing and Facilities

Kevin Thach

Section Head, Systems

VerĂ³nica Melesse Vergara

Section Head, Operations

Tom Beck

Section Head, Science Engagement

Man in a white shirt with dark hair facing the camera

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

Man in suit and orange tie in front of blue background

David Langley

Finance Officer

Suzy Tichenor

Director, Industrial Partnerships

Sarah Crossley

Sarah Crossley

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

Group Leader, HPC Infrastructure

Zach Mayes

Acting Group Leader, HPC Platforms

Paul Peltz

Paul Peltz

Group Leader, HPC Scalable Systems

Sherry Chandler

Administrative Assistant

VerĂ³nica Melesse Vergara

Section Head, Operations

Katie Bethea

Group Leader, User Access, Outreach, & Communications

Chris Fuson

Group Leader, User Assistance

Rajesh Kalyanam

Rajesh Kalyanam

Group Leader, Data Platforms and Services

Fernando Posada

Group Leader, System Acceptance & User Environment

Sonya Mowery

Administrative Assistant

Tom Beck

Section Head, Science Engagement

Tom Beck

Acting Group Leader, HPC-Quantum

Reuben Budiardja

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

Myranda White

Administrative Assistant

Man in a white shirt with dark hair facing the camera

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, Technology Integration

Jessica Whitt

Administrative Assistant