Leadership Team
Triad provides the leadership and organizational structure to sustain our nation’s security, delivering stockpile stewardship expertise; enhancing mission-focused ST&E; providing safe, secure and reliable operations; and comprehensive assurance.
“I am excited and honored to lead the Triad team to manage Los Alamos National Laboratory. Our team ensures continuity of mission delivery while bringing a fresh operational approach. Under my leadership, we will drive positive changes in organizational culture. This team is committing to partnering with the NNSA with integrity and transparency as an integral member of the National Security Enterprise.”
– Dr. Thom Mason
Thomas Mason
Laboratory Director
Thomas (Thom) Mason is the President and CEO of Triad National Security, LLC (Triad) and serves as the Director of Los Alamos National Laboratory (LANL).
Prior to becoming LANL Laboratory Director Thom was the Senior Vice President for Global Laboratory Operations at Battelle where he had responsibility for governance and strategy across the six National Laboratories that Battelle manages or co-manages. Prior to joining Battelle, Thom worked at Oak Ridge National Laboratory (ORNL) for 19 years, including 10 years as the Laboratory Director. Under his leadership, ORNL saw significant growth in programs, new facilities, and hiring while achieving record low safety incident rates. Before becoming Laboratory Director, he was Associate Laboratory Director (ALD) for Neutron Sciences, ALD for the Spallation Neutron Source (SNS), and Director of the Experimental Facilities Division. During his time in Oak Ridge, Thom was active in the community serving as Chair of the Oak Ridge Public Schools Education Foundation as well as Innovation Valley, the Knoxville-Oak Ridge area regional economic development organization. He moved to ORNL from the University of Toronto where he was a faculty member in the Department of Physics and previously worked as a Senior Scientist at Risø National Laboratory and a Postdoc at AT&T Bell Laboratories. For the past 30 years, he has been involved in the design and construction of scientific instrumentation and facilities and the application of nuclear, computing, and materials sciences to solve important challenges in energy and national security.
Thom has a Ph.D. in Experimental Condensed Matter Physics from McMaster University and a BSc in Physics from Dalhousie University.
Robert Webster
Deputy Director
Weapons
Weapons
Robert (Bob) Webster serves as the Deputy Director Weapons at Los Alamos National Laboratory (LANL). In this role, Bob will have direct line management responsibility for planning, coordinating, and integrating the Weapons Program, particularly for the directorates of Weapons Engineering, Weapons Design and Weapons Production.
Bob is a 29-year veteran of the Weapons Program at LANL and a recognized leader in Stockpile Stewardship. He began his laboratory career as a graduate student at LANL in 1984, becoming a consultant, then a technical staff member, and advancing through multiple national security positions to his present position: Principal Associate Director for Weapons Programs where he integrates the key capabilities of three associate directorates – Plutonium Science and Manufacturing (ADPSM), Weapons Physics (ADX), and Weapons Engineering and Experiments (ADW). During Bob’s tenure, the weapons program has consistently met or exceeded overall performance expectations and made significant contributions to LANL and NNSA missions—a compelling record of achievements that he brings to the many challenges of serving as the Deputy Director Weapons.
Bob received a Ph.D. and M.S. in Nuclear Engineering from Purdue University, and a M.S. in Electrical Engineering and Applied Physics and a B.S. in Electrical Engineering from Case Western Reserve University.
Patrick Fitch
Deputy Director
Science, Technology, and Engineering
Science, Technology, and Engineering
Patrick (Pat) Fitch serves as the Deputy Director for Science, Technology & Engineering for Los Alamos National Laboratory.
Most recently, Pat was the Associate Laboratory Director for Chemical, Earth, & Life Sciences. Prior to LANL, he was the President of the Battelle National Biodefense Institute, LLC (BNBI) and founding Director of the National Biodefense Analysis and Countermeasures Center (NBACC). BNBI has managed and operated NBACC as a Federally Funded Research and Development Center for the Department of Homeland Security since its formation in 2006. Prior to joining Battelle, Pat worked at Lawrence Livermore National Laboratory for 22 years where he served as Program Leader, Division Leader, Center Director, and Acting Deputy Associate Lab Director leading ChemBio defense, genomics, biotechnology, engineering research, and health care technologies.
Pat has a Ph.D. in Electrical Engineering from Purdue University and B.S. degrees in Physics and Engineering Sciences from Loyola College, Maryland. Pat’s recent research interests have been the application of genomics, host-pathogen biology, and biosafety to bioforensic analysis and threat characterization in biodefense.
Mark Davis
Deputy Director
Operations
Operations
Mark Davis serves as the Laboratory Director for Operations at Los Alamos National Laboratory.
Davis has over 40 years of experience in nuclear operations, including more than 30 years of strategic, operational and policy experience for the Department of Defense and the Department of Energy. He joined ALDWP after almost five years at Savannah River Nuclear Solutions as part of the senior management team. While at SRNS, Davis managed more than 1,300 direct employees and support personnel with a $300 million annual budget, and led approximately $30 million per year in infrastructure improvements, requiring cross-organizational collaboration to plan and execute projects amid ongoing critical site operations. Prior to SRNS, he served for 36 years in the U.S. Navy, retiring with the rank of captain. During his Navy career, Davis commanded two fast attack submarines and a forward deployed squadron and completed numerous overseas assignments and forward deployments across the globe. His final tour in the Navy was on the staff of the Department of Energy's deputy secretary.
Davis holds a master's in ocean engineering from the Massachusetts Institute of Technology and a bachelor's in civil engineering from San Diego State University.
Frances Chadwick
Staff Director
Laboratory Staff Director Frances Chadwick supports the Lab’s director and deputy directors and manages the Director’s Office and the six divisions that report into it. These include the Office of General Counsel, Communications and External Affairs, Ethics and Audit, the Office of Counterintelligence, the Community Partnerships Office, and the Office of National Security & International Studies. In this role, Frances is the executive champion for the Lab’s relationship with the communities of Northern New Mexico. She is also the Lab’s liaison with the Triad National Security, LLC Board of Directors, chaired by former Lab Director Michael Anastasio.
Frances has worked at the Laboratory since 1996 in various positions in Finance and Infrastructure. In her previous role, she managed the Lab’s portfolio of mission-critical facilities as program director for Weapons Infrastructure in the Weapons Directorate. In this role she also served on the Department of Energy’s Infrastructure Executive Council as the representative from NNSA sites and was the Lab’s lead for collaborations with the United Kingdom’s Atomic Weapons Establishment in the area of Infrastructure and Operations. Prior to this, Frances was the business manager for Weapons Programs, overseeing all financial, planning, and procurement activities. She is nationally recognized for her effective advocacy for excellence in support services to the mission, and in enabling the successful planning and solid financial support for the Lab’s mission-critical facilities.
Frances serves on the Laboratory’s Benefits and Investments Committee and is a board member of the Los Alamos Community Foundation. Frances is the executive champion for the Lab’s African American Employee Resource Group, and is a strong advocate for working parents. Originally from the U.K., Frances holds a bachelor’s degree from Oxford University, England, and an MBA from the University of California, Davis Graduate School of Management.
Charlie Nakhleh
Associate Laboratory Director
Weapons Physics
Weapons Physics
Charles W. Nakhleh is the Associate Laboratory Director for Weapons Physics (ALDX) at Los Alamos National Laboratory. In this role, he has line responsibility for the nuclear weapons designers and simulation code architects at the Laboratory, as well as program responsibility for the NA-11 weapons science, computing, and technology maturation portfolio.
Prior to taking on his current role, he was the Executive Officer to the Deputy Director for Weapons (DDW), where he was responsible to the DDW for integrating and aligning activities across the weapons program. From 2013 to 2018, he was the Division Leader of the X-Theoretical Design Division (XTD) at Los Alamos National Laboratory. As the XTD Division Leader, he oversaw nuclear weapon physics design, assessment, and certification efforts at the Laboratory. Before returning to Los Alamos, he led the Inertial Confinement Fusion (ICF) Target Design Department in the Pulsed Power Sciences Center at Sandia National Laboratories. At Sandia, he led theoretical design and analysis efforts for magnetically-driven ICF and radiation-effects targets for the Z pulsed-power facility and indirect-drive experiments for the National Ignition Campaign (NIC). Before joining Sandia, he served as Group Leader (acting) and Deputy Group Leader for the Thermonuclear Applications Group in the Applied Physics (X) Division of Los Alamos. He spent nearly a decade before that as a staff member in X Division, where he served as a weapon system point-of-contact, worked extensively on uncertainty quantification, and made significant contributions to a wide variety of weapons physics and design issues.
Charlie is a graduate of the Theoretical Institute of Thermonuclear and Nuclear Studies (TITANS) program at Los Alamos. He has served on a wide variety of advisory panels, including as a founding member of the NNSA’s Predictive Science Panel, a consultant to JASON, an adviser to the Undersecretary of Energy for Science on the NIC, and as an adviser to the NNSA on a variety of weapons physics issues. He received his Ph.D. in Physics from Cornell University in 1996.
James Owen
Associate Laboratory Director, Weapons Engineering
James Owen will serves as the Associate Laboratory Director, Weapons Engineering for Los Alamos National Laboratory.
James has worked in LANL’s Nuclear Weapons Program for more than 25 years and is a recognized leader across the Nuclear Security Enterprise (NSE). He has demonstrated technical and program leadership abilities in successfully executing some of NNSA and DoD’s most significant and challenging nuclear weapon programs, including the B61 Alt 357, W80 LEP, W76-1/Mk4A LEP, B61-12 LEP, W88 Alt 370 and W88 Alt 940. In his current role as Associate Director for Weapons Engineering and Experiments, James manages the operations and infrastructure of High Explosives (HE) science and engineering research/development across 21 square miles, which are critical to LANL’s execution of nuclear weapons mission. A native of northern New Mexico, James began working at LANL as a high school summer student and participated in the Graduate Research Assistant program before becoming a full-time staff member.
James earned a M.S. in Engineering from the University of Colorado at Boulder and a B.S. in Mechanical Engineering from New Mexico State University.
David Dooley
Associate Laboratory Director
Weapons Production
Weapons Production
David Dooley is the associate Laboratory director for Weapons Production (ALDWP) at Los Alamos National Laboratory. In this role, he has responsibility for the production and evaluation of plutonium pits, nuclear weapon detonators, and other nonnuclear components. ALDWP also oversees plutonium processing and disposition, manufacturing of power supplies for NASA deep space missions, surveillance, nuclear materials management, and waste operations.
Dooley has 27 years of leadership experience in stakeholder and workforce relationships, production, complex nuclear facility operations, research and development, decontamination and demolition, and environmental waste remediation and disposal. He has performed within and complied with multiple Department of Energy safety and security orders, as well as state and federal regulatory agencies, in nuclear facilities at three DOE sites: Los Alamos, Hanford, and Savannah River.
Over the past five years, Dooley has led and integrated the work of 2,000 full-time equivalent personnel across 80 Lab organizations to deliver all milestones on schedule and within budget — including the necessary builds to achieve W87-1 plutonium pit first production unit.
Dooley holds a doctorate in material science and bachelor's and master's degrees in nuclear engineering.
Nancy Jo Nicholas
Associate Laboratory Director
Global Security
Global Security
Nancy Jo Nicholas serves as Associate Laboratory Director, Global Security for Los Alamos National Laboratory. In this role, she leads the execution of programs in the areas of Defense Nuclear Nonproliferation, Nuclear Counter-Proliferation and Counter-terrorism, and Strategic Partnership Programs, as well as oversees the Field Intelligence Element.
Nancy Jo has worked for LANL since 1990, currently serving as LANL’s Principal Associate Director for Global Security. Prior to this role, she was the Associate Director for Threat Identification and Response. Her expertise integrates national and international policies in nuclear nonproliferation and nuclear materials management with fast-paced innovations and technology development to address complex threats to global security. Nancy Jo serves on the National Academy of Sciences Nuclear and Radiation Studies Board and the Intelligence Science and Technology Experts Group. She is a Fellow of the Institute of Nuclear Materials Management (INMM), and recently served a two-year term as president of the INMM. She also recently served on the Board of Directors of the Vienna-based World Institute for Nuclear Security or WINS.
Nancy Jo has a M.A. in Nuclear Physics from The George Washington University and a B.S. in Mathematics and Physics from Albright College.
Srinivas Iyer
Associate Laboratory Director
Chemical, Earth and Life Sciences
Chemical, Earth and Life Sciences
Dr. Srinivas Iyer serves as the Associate Laboratory Director for Chemical, Earth and Life Sciences at Los Alamos National Laboratory. Iyer most recently lead the Laboratory's program office for DOE Office of Science, which oversees all Lab research that is funded by the seven DOE Office of Science (DOE-SC) programs. The program's portfolio is over $200 million and spans the entire technical breadth of the Laboratory.
Iyer joined Los Alamos in 1999 as a postdoctoral fellow, where he contributed to the low-dose radiation effects program and developed advanced analytical biochemistry methods using mass spectrometry and separation science. In the years since, he has worked across the spectrum of national security science and held roles of increasing responsibility, including division leader for Bioscience and program manager for DOE-SC's Biological Systems Science Division at the Lab.
He holds a Ph.D. in biochemistry and biophysics from the University of Houston and completed postdoctoral training at the University of New Mexico School of Medicine.
Mark Chadwick
Associate Laboratory Director
Simulation, Computation, and Theory
Simulation, Computation, and Theory
Dr. Mark Chadwick currently serves as the Associate Laboratory Director for Simulation, Computation, and Theory at Los Alamos National Laboratory. He was most recently the interim Deputy Director for Science, Technology & Engineering and previously the chief scientist and chief operating officer for the Associate Laboratory Directorate for Weapons Physics.
Chadwick is a nuclear physicist who has worked at Los Alamos for 33 years across both the DDSTE and Weapons organizations. He is a Laboratory Fellow, American Physical Society Fellow, American Nuclear Society Fellow, and recipient of DOE’s 2011 E.O. Lawrence Award.
He obtained his bachelor’s and doctorate degrees in physics from Oxford University.
Ellen Cerreta
Associate Laboratory Director
Physical Sciences
Physical Sciences
Ellen Cerreta serves as Associate Laboratory Director for Physical Sciences (ALDPS) at Los Alamos National Laboratory. In this role, Ellen Cerreta is responsible for overseeing the development and application of a broad set of capabilities in materials science and experimental physics to programs and problems of national importance, including through the stewardship and advancement of the Los Alamos Neutron Science Center (LANSCE). The directorate includes five research and development divisions, a facility operations division, two program offices and the three Los Alamos-based national user facilities.
Cerreta, who most recently led the Materials Science and Technology Division, brings more than 20 years of experience to the role. Throughout her career, Cerreta has been deeply involved in a number of professional societies and working with academia. She was the 2021 president of The Minerals Metals and Materials Society (TMS) and has served on the TMS and ASM International board of directors and board of trustees, respectively. She is a 2016 ASM International fellow. Formerly known as the American Society for Metals, ASM International is an association of materials-centric engineers and scientists.
Cerreta holds a Bachelor of Science in aerospace engineering from the University of Virginia and master’s and doctoral degrees in materials science and engineering from Carnegie Mellon University. She joined the Lab in 2001 as a postdoctoral fellow in the then Structure-Property Relations group (MST-8).
Mark Anthony
Associate Laboratory Director
Plutonium Infrastructure
Plutonium Infrastructure
Mark Anthony serves as Associate Laboratory Director for Plutonium Infrastructure (ALDPI) at Los Alamos National Laboratory. In this role, he oversees execution of the 30 pits-per-year mission through modernization of the TA-55 infrastructure and capabilities.
Mark has more than 32 years of experience leading complex technical organizations with significant fiscal and programmatic responsibilities, most recently at European Spallation Source (ESS), a $3.8 billion effort to build and operate the world’s most powerful neutron source for the European Research Infrastructure Consortium. In his role at ESS, based in Lund, Sweden, he served as Project Director and Deputy to the Director General responsible for delivery of the ESS Construction Project according to its baseline scope, schedule, and cost. Mark led divisions, subproject managers, and support teams in achieving project goals, especially acting to facilitate integration of work across the subprojects.
Prior to his role at ESS, Mark served as CEO for nuclear fuel and services at General Electric Hitachi Nuclear Energy responsible for approximately 10% of GE Nuclear Business and the EU region strategic direction for growth and order targets.
Mark served in the U.S. Marine Corps for four years after high school and was stationed at several places at Paris Island in South Carolina, Twentynine Palms in California, Okinawa Japan, and Camp Lejeune, North Carolina. Following his service with the Marines, Mark has a BSME from Penn State University and a master’s degree from Drexel University.
Steven A. Coleman
Associate Laboratory Director
Environment, Safety, Health, and Quality
Environment, Safety, Health, and Quality
Steven serves as Associate Laboratory Director for Environment, Safety, Health and Quality.
He is leader and educator with a PhD in management and a combined 36 years of diversified experience in environment, safety and health leadership; operations; and project engineering/management at nuclear-capable facilities. He has worked at Brookhaven National Laboratory for 30 years, most recently as Associate Laboratory Director of Environment, Safety and Health. In the position, he is responsible for the operations of the ES&H Directorate, with 140 engineers and technical staff and an annual budget of about $36M. Steven has significant experience in other leadership roles, including as manager of the Radiological Control Division at Brookhaven. In that role, he managed an annual budget of $7.5 million and guided the implementation of the Laboratory’s nuclear, radiological control, and protection programs. This involved extensive collaboration with the DOE Site Office and state and local regulators to set environment, safety and health strategic goals for Brookhaven’s radiological operations. As Integrated Safety Management Program Manager, he established BNL’s programmatic framework for implementing DOE’s Integrated Safety Management. He also worked as Brookhaven’s Waste Operations Manager, managing all aspects of BNL’s radioactive and hazardous waste management programs, including day-to-day Hazard Category 2 Nuclear, Decontamination and Decommissioning, and Environmental Restoration operations.
His early career was dedicated to the U.S. Navy, where he served as a Nuclear Electrical Operator responsible for the safe and efficient operation and maintenance of the reactor system and the electrical control and protection systems.
Steven graduated from University of Phoenix with a Doctor of Management in Organizational Leadership in 2011. His Master of Science degrees were earned from George Washington University in Project Management in 2004 and from the New York Institute of Technology in Energy Management in 1999. Steven also has a Bachelor of Science in Engineering Science and Liberal Arts from Regents College, and is a graduate of the Leadership for Senior Executives Program at Harvard Business School and the Battelle Laboratory Operations Leadership Academy (LOLA).
Scott Aeilts
Associate Laboratory Director
Business Management
Business Management
Scott Aeilts serves as the Associate Laboratory Director, Business Management for Los Alamos National Laboratory.
Aeilts comes to Los Alamos from Sandia National Laboratories (SNL), where he served most recently as mission services associate labs director. In that role, he was responsible for SNL's financial management systems, business excellence and process improvements, work authorization systems, information technology, purchasing, and other administrative services. Prior to SNL, Aeilts had a long history in business management for defense-related entities, including Alliant Techsystems and the Kansas City National Security Campus.
Aeilts holds an MBA from Washington University, St. Louis, and is a CPA and a Six Sigma Green Belt.
Bret Simpkins
Associate Laboratory Director
Facilities and Operations
Facilities and Operations
Bret Simpkins serves as the Associate Laboratory Director for Facilities and Operations at Los Alamos National Laboratory.
Since 2014, Bret was the Director of Facilities and Operations for Pacific Northwest National Laboratory (PNNL) where he was responsible for campus-wide facility strategic planning, projects and engineering, operations and maintenance, nuclear operations, and real estate management functions. Prior to this role, he served in a number of senior level positions at PNNL including Director of Nuclear Operations, Chief Operating Officer for the National Security Directorate, and Division Manager of Nuclear Science, Safety, and Nonproliferation. Bret has more than 30 years of experience, including management and leadership of large inter-disciplinary R&D, applied science, technology, and engineering activities and organizations. Topical areas impacted by his work include: directed energy weapons, nuclear reactor safety, safety and physical security of nuclear facilities and materials, nuclear weapons assembly/disassembly process safety, global security, nuclear arms control and nonproliferation.
Bret received his M.S. in Nuclear Engineering and B.E. in Energy and Power Systems from the University of New Mexico. He is a registered Professional Engineer.
Unica K. T. Viramontes
Associate Laboratory Director
Defense Protection
Defense Protection
Unica K. T. Viramontes serves as the Associate Laboratory Director for Defense Protection (ALDDP) at Los Alamos National Laboratory. Unica is responsible for the leadership, management, oversight, strategic planning, and execution of ALDDP portfolio.
Unica started her career at Los Alamos National Laboratory in 1998. Throughout her 24-year career, Unica started as a High-School Coop student, has held roles of increasing responsibility in more than seven functional security and safeguards areas. Prior to becoming Associate Laboratory Director, she served as Senior Director for the Defense Security Program providing strategic and technical leadership for Safeguards, Security and Emergency Management programs; Security Division Leader setting the Division’s direction to respond to evolving physical security threats and programmatic needs; and the Program Director for the Mission Assurance, Security, and Emergency Response where she provided technical leadership and management of the Program Office activities and program management support for all aspects of the Laboratory-wide security and safeguards program. She was responsible for the development and growth of the program, by 25% in two years, increasing the annual operating budget to approximately $175M.
Unica holds a BA from the University of California, Berkeley and an MBA from the University of New Mexico Anderson School of Management.
David F. Teter
Associate Laboratory Director
Infrastructure and Capital Projects
Infrastructure and Capital Projects
David F. Teter is the associate Laboratory director for Infrastructure and Capital Projects (ALDICP), where he is responsible for the leadership, management, oversight, strategic planning and execution of the Laboratory’s portfolio of construction projects. In this role, Dave leads the integration of planning, management and execution of infrastructure projects across Los Alamos National Laboratory.
Dave has 26 years of professional experience in multiple roles across the Laboratory, including project, program and line management of large, complex and hazardous facilities. Prior to his current role, Dave served for two years as the director of the Weapons Infrastructure and Planning Office (WIPO) at LANL, where he was responsible for funding the operations, maintenance and modernization of the Lab’s nuclear, high explosive and specialized weapons facilities. Besides repairing and improving the lifespan of existing facilities, the office provides long-range planning for weapons facility modernization to meet future mission needs.
Dave joined LANL in 1996 as a post-doctoral researcher, after receiving his PhD from the University of Illinois. The following year, he became a technical staff member in MST-6, and built his career at the Laboratory around materials science. From 2012 to 2019, he was division leader of Materials Science & Technology (MST), where he supervised 280 employees. That work spanned high-hazard nuclear facility operations to fundamental materials science research and development. He was the recipient of Awards of Excellence for the Nuclear Weapons Program and Stockpile Stewardship Program in 1999, 2000, 2001 and 2004.
Dave is a recognized expert in materials science and advanced manufacturing, with more than 20 peer-reviewed publications and several classified publications, and has served on a number of review boards and advisory panels.