Thomas Zacharia

Laboratory Director

Thomas Zacharia, director of Oak Ridge National Laboratory since July 1, 2017, guides the application of an exceptionally broad set of core capabilities to the solution of compelling problems in science and technology, exploiting ORNL’s signature strengths in materials science and engineering, high-performance computing and computational sciences, neutron science, and nuclear science and technology to deliver mission outcomes for the U.S. Department of Energy and other sponsors.

Susan S. Hubbard
Susan S. Hubbard

Deputy for Science and Technology

Susan Hubbard guides one of the nation’s most extensive portfolios of research and development, spanning computing and computational sciences, materials science, environmental and biological research, energy science and technology, isotope research and development, fission and fusion energy, neutron sciences, and national security sciences. In concert with the Deputy for Laboratory Operations, she supports the Laboratory Director in the planning, integration, and execution of Laboratory-level initiatives.

Alan Icenhour
Alan Icenhour

Deputy for Laboratory Operations

Alan Icenhour coordinates overall operations and support functions at the Oak Ridge National Laboratory: facilities operations; environment, safety, and health; business operations; security; human resources; communications; and technology transfer. In concert with the Deputy Director of Science and Technology, he supports the Laboratory Director in the planning, integration, and execution of Laboratory-level initiatives.

Lindsey Twardy
Lindsey Twardy

Chief of Staff

Lindsey Twardy serves as an advisor to the Laboratory Director and helps to integrate leadership across ORNL to fulfill the Lab’s mission objectives and ensure operational effectiveness.

Ken Andersen
Ken Andersen

Associate Laboratory Director for Neutron Sciences

Ken Andersen brings extensive experience to the neutron scattering research and user programs at ORNL. He joined ORNL from the European Spallation Source in Sweden, where he led the Neutron Instruments Division and oversaw the selection and construction of instruments from conceptual development through design, procurement, installation and commissioning. Andersen previously led the Neutron Optics Laboratory at Institut Laue Langevin and has commissioned and operated neutron scattering instruments at both ILL and the ISIS Neutron and Muon Source at the Rutherford Appleton Laboratory in the United Kingdom.

J. Scott Branham
J. Scott Branham

Chief Financial Officer

Chief Financial Officer for UT-Battelle since April 2011, Scott received a B.S. from Concord College (now Concord University) and an MBA from Auburn University. He is also a certified public accountant. Before joining UT-Battelle as Chief Audit Executive in 2000, Scott served as Chief Audit Officer for Oak Ridge Associated Universities and as an auditor for the U.S. Department of Energy’s Office of Inspector General.

Jeremy Busby

Interim Associate Laboratory Director, Fusion and Fission Energy and Science

Jeremy Busby is the interim Associate Laboratory Director for Fusion and Fission Energy and Science at Oak Ridge National Laboratory. He oversees the directorate’s unique facilities, capabilities, and talented scientists and engineers who are tackling such challenges as extending operations of the current US nuclear reactor fleet; investigating economical and flexible advanced reactor systems; and making fusion energy a viable power source.

Bart O. Iddins
Bart O. Iddins

Director for Environment, Safety, and Health

Dr. Bart Iddins serves as director of Environment, Safety, Health and Quality. He joined the Laboratory in June 2018 as director of the Health Services Division after retiring from the Air Force as a major general. He concluded his military career as commander of the 59th Medical Wing at Joint Base San Antonio, Texas, and CEO of the San Antonio Military Health System, with 8,000 direct personnel and a $1.2 billion budget.

Cynthia Jenks
Cynthia Jenks

Associate Laboratory Director for Physical Sciences

Cynthia Jenks stewards ORNL’s broad physical sciences portfolio, with particular emphases on quantum materials; structural materials and alloys; soft materials; nanoscience; and applications of materials and chemistry in energy and security.

David Keim Director of Communications
David Keim

Director of Communications

As Director of Communications, David is responsible for external and internal communications, community relations, and protocol visits for Oak Ridge National Laboratory.

Moe Khaleel
Moe Khaleel

Associate Laboratory Director for National Security Sciences

Dr. Moe Khaleel guides the research and development of science-based solutions to counter critical threats to public safety, national defense, energy infrastructure and the economy. Leveraging the broad science foundation at ORNL, he oversees the work of multi-disciplinary research teams with signature capabilities in nuclear and uranium science, high-performance computing, geographic information science, cyber security science and advanced manufacturing.

Douglas B. Kothe
Douglas B. Kothe

Associate Laboratory Director for Computing and Computational Sciences

Exascale Computing Project Director

Doug has more than three decades of experience in conducting and leading applied R&D in computational applications designed to simulate complex physical phenomena in the energy, defense, and manufacturing sectors.

C. Gail Lewis
C. Gail Lewis

Chief Audit Executive

Gail leads the Internal Audit Directorate, which is responsible for all audit activities and the staff concerns program at ORNL. The organization provides independent, objective assurance and consulting services that are designed to support and improve the effectiveness of risk management, control, and governance processes through evaluations of all ORNL management systems, processes, and programs.

David J. Mandl
David J. Mandl

General Counsel

David is the General Counsel at the Oak Ridge National Laboratory and Secretary of UT-Battelle, LLC.  He has 20 years of legal experience, primarily in the areas of environmental, safety and health law; nuclear safety and radiological protection; security (including physical and information/cyber security); corporate law and governance; and fraud and the civil False Claims Act.  David has served as primary legal counsel to various ORNL organizations, committees and projects, and routinely advises senior management regarding regulatory compliance, risk management and public relations.

Kathryn McCarthy
Kathryn McCarthy

US ITER Project Director

Kathy McCarthy joined ORNL after three years as vice president for science and technology and laboratory director for the Canadian Nuclear Laboratories, where she oversaw a staff of 650 and grew the labs’ commercial work. She previously held a variety of engineering and leadership roles at Idaho National Laboratory, including director of domestic programs in INL’s Nuclear Science and Technology Directorate, director of the Light Water Reactor Sustainability Program Technical Integration Office, and national technical director for the Systems Analysis Campaign for DOE Nuclear Energy’s Fuel Cycle R&D Program.

Graeme Murdoch
Graeme Murdoch

Director, Second Target Station Project

Graeme Murdoch is the interim project director for the Second Target Station. He has over 35 years of progressive experience working in technical and management capacities in a particle accelerator and fusion engineering environment. 

Tyler Owens
Tyler Owens

Federal Affairs Director

Tyler Owens is federal affairs director at ORNL. In this role, he serves as ORNL’s senior representative and chief liaison to government officials, industry, think tanks, and university representatives in Washington, D.C. He provides guidance to the laboratory director to develop and execute strategies that best position ORNL in the evolving federal policy environment. He is also responsible for presenting ORNL’s priorities to Congress, the administration, and federal agencies.

Jimmy Stone Director of Facilities and Operations
Jimmy Stone

Director of Facilities and Operations

Jimmy is Director of the Facilities and Operations Directorate at the Oak Ridge National Laboratory in Oak Ridge, Tennessee. He manages seven divisions that provide critical laboratory support services. These include facility operations, laboratory protection, engineering and construction management, materials fabrication, site services, logistical functions, and craft services.

Xin Sun
Xin Sun

Associate Laboratory Director, Energy Science and Technology

As ORNL’s Associate Laboratory Director (ALD) for the Energy Science and Technology Directorate, Dr. Xin Sun leads a $296 million research portfolio focused on translating science into solutions for the most critical problems facing society at the nexus of energy and security.

Balendra Sutharshan
Balendra Sutharshan

Associate Laboratory Director for Isotope Science and Engineering

Associate Laboratory Director Dr. Balendra Sutharshan, who joined ORNL in 2021, leads the Isotope Science and Engineering Directorate (ISED), which is composed of two research divisions (Radioisotope Science and Technology, and Enrichment Science and Engineering) and one operating division (Nonreactor Nuclear Facilities).

Stan Wullschleger
Stan Wullschleger

Associate Laboratory Director for Biological and Environmental Systems Science

As ORNL’s Associate Laboratory Director (ALD) for Biological and Environmental Systems Science, Dr. Stan Wullschleger leads a $107 million research portfolio targeting the convergence of biology, ecology, engineering, data discovery, physical sciences, and computing to advance U.S. competitiveness in the global bioeconomy and Earth system sustainability.

Jody Zahn
Jody Zahn

Director of Human Resources

Jody Zahn is the Human Resources Director at Oak Ridge National Laboratory and oversees the talent acquisition, talent services, labor relations, benefits, diversity, immigration, employee and organizational development, and compensation functions at the laboratory.