Leadership Team 2022-03-22T17:59:29-04:00


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.  Most recently he 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.

Bob Webster

Robert Webster

Deputy Director 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.

John Sarrao

John Sarrao

Deputy Director Science, Technology, and Engineering

John Sarrao serves as the Deputy Director Science, Technology, and Engineering at Los Alamos National Laboratory (LANL). John is currently the Principal Associate Director for Science, Technology, and Engineering (PADSTE) at LANL, leading the Laboratory’s STE capabilities in supporting the laboratory’s national security mission. Previously, he served as the Associate Director for Theory, Simulation, and Computation for five years. John has also held a number of leadership positions within LANL’s materials community. His primary research interest is in the synthesis and characterization of correlated electron systems, especially actinide materials. John was the 2013 winner of the Department of Energy’s E.O. Lawrence Award and is a Fellow of the American Association for the Advancement of Science (AAAS), the American Physical Society (APS), and Los Alamos National Laboratory. John’s personal research and technical leadership career has emphasized national security science from plutonium physics research to advanced materials design and discovery to stewarding LANL’s high performance computing resources and simulation capabilities. John received a Ph.D. in physics from the University of California, Los Angeles based on thesis work performed at LANL. He also has a M.S. in physics from the University of California, Los Angeles and a B.S. in physics from Stanford University.

Kelly Beierschmitt

Kelly Beierschmitt

Deputy Director Operations

Kelly Beierschmitt serves as the Deputy Director Operations of Los Alamos National Laboratory (LANL). Kelly has worked more than 30 years in the service of critical DOE missions. Most recently, he was the Deputy Laboratory Director for Science and Technology and Chief Research Officer for Idaho National Laboratory (INL) where he had responsibility for setting the scientific and engineering agenda and overseeing the research, development, demonstration and deployment of the critical missions for the laboratory. Prior to joining INL, Kelly worked at Oak Ridge National Laboratory (ORNL) for 13 years where he served as Associate Laboratory Director for both the Neutron Sciences and the Nuclear Science and Technology Directorates. He also served as ORNL’s Director of Environment, Safety, Health and Quality. Kelly moved to Oak Ridge from the Pacific Northwest National Laboratory where he held several roles both in the sciences and support functions. Kelly began his career at the Pantex Plant, where he served as a nuclear explosives engineer, developed some of the earliest Safety Analysis Reports, retooled high explosives operations and developed one of the earliest Master Safeguards and Security Agreements. Kelly’s entire career has emphasized the synergistic integration of science, technology and engineering with operational excellence to ensure effective mission delivery in a wide array of research and development environments – ranging from forefront experimental research in physical sciences to developmental engineering requiring hazardous nuclear operations. Kelly has a Ph.D. in Industrial Engineering (Risk, Reliability Engineering) from Texas Tech University and a BSc in engineering mathematics from West Texas A&M University. He is a registered Professional Engineer, Certified Safety Professional in Comprehensive Practice, and a member of the American Nuclear Society, Materials Research Society, and other professional societies.

Francis Chadwick

Frances Chadwick

Staff Director

Frances Chadwick serves as the Laboratory Director’s Staff Director. In this role, she supports the Director and Deputy Directors and manages the various offices that report into the Director’s office. Frances has worked at Los Alamos National Laboratory (LANL) since 1996 in various positions in Finance and Infrastructure. In her current role, she manages the Laboratory’s $450M portfolio of mission-critical facilities as Program Director for Weapons Infrastructure in PADWP. This involves overseeing both current year execution of operations, maintenance and facility projects which span most of the laboratory as well as planning the outyear needs for capital investments and operations at the site. Prior to this, Frances was the Business Manager for the Weapons Programs, overseeing financial, planning and procurement activities for the Weapons Programs. Frances serves on the Laboratory’s Benefits and Investments Committee and is a member of the Department of Energy’s Infrastructure Executive Council as the representative from the NNSA sites. Frances is also the laboratory lead for LANL’s collaborations with the UK’s Atomic Weapons Establishment at AWE in the area of Infrastructure & Operations. Frances is nationally recognized for her effective advocacy for excellence in support services to the Weapons program, and in enabling the successful planning and solid financial support for our mission-critical facilities. Originally from the UK, Frances holds a bachelor’s degree from Oxford University, England, and an MBA from University of California, Davis Graduate School of Management.

Photo: Charlie Nakhleh

Charlie Nakhleh

Associate Laboratory Director, 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 Owens

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.

Dave Eyler

John Benner

Associate Laboratory Director, Weapons Production

John Benner 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.

Prior to taking on his current role, Benner was the executive officer to the deputy Laboratory director for Weapons (DDW). He was responsible to the DDW for integrating and aligning activities across the weapons program.

From 2012 to 2017, Benner served as the Laboratory’s associate director for Weapon Engineering and Experiments (ADW) and chief engineer for Nuclear Weapons. In these roles, Benner led all weapons engineering, explosive science, and testing activities at the Laboratory. He oversaw the management and execution of weapons modernization activities and the management of support for Los Alamos stockpile systems.

From 2006 to 2012, Benner served as the Weapon Systems Engineering (W) Division Leader, responsible for all weapons engineering activities at Los Alamos, including assessment, refurbishment, certification, and supporting R&D for Los Alamos–designed systems in the enduring stockpile.

From 2002 to 2006, Benner led the W76-1 life extension program at Los Alamos during development engineering and into production engineering.

From 2019 to 2020, Benner was a senior technical advisor to the deputy administrator for Defense Programs at NNSA headquarters in Washington, D.C. From 2017 to 2019, Benner was the vice president and chief operating officer for MSTS, the management and operating contractor for the Nevada National Security Site (NNSS). In this role, he was responsible for operational and technical integration of all experimental activities across the NNSS site.

Benner holds a master’s of science degree in mechanical engineering and a bachelor of science degree in aerospace engineering from West Virginia University.

Nancy Jo Nicholas

Nancy Jo Nicholas

Associate Laboratory Director, 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. She has a M.A. in Nuclear Physics from The George Washington University and a B.S. in Mathematics and Physics from Albright College.

Toni Taylor

Antoinette Taylor

Associate Laboratory Director, Physical Sciences

Antoinette (Toni) Taylor serves as the Associate Laboratory Director, Physical Sciences for Los Alamos National Laboratory. She currently serves as the Deputy Associate Director for Chemistry, Life and Earth Sciences at LANL. Toni’s background is in nanophotonics and ultrafast dynamics of quantum and nanoscale materials. Following a postdoc at Cornell University in ultrafast dynamics of condensed matter systems, she became a staff member at AT&T Bell Laboratories in the Lightwave Systems Department. Toni came to LANL in 1986 to work on the Los Alamos Bright Source, one of the first ultrahigh intensity lasers used to investigate light-matter interactions in the high field regime. Following that program, she became Project Leader for Advanced Diagnostics for the Pulsed Power Hydrodynamics Program at LANL, responsible for diagnostic development activities at the Atlas Pulsed Power Facility. Toni then served as the Director of the Center for Integrated Nanotechnologies, a joint LANL/Sandia nanoscience center funded through DOE Basics Energy Sciences and as the Division Leader for Materials Physics and Applications. She is a Fellow of the America Physical Society (APS), the Optical Society of America, the American Association for the Advancement of Science and the Laboratory. Toni is a former chair of the APS Division of Laser Science and is currently the Vice-Chair of the APS Division of Materials Physics. Toni received her B.S., M.S. and Ph.D. degrees in physics from Stanford University where she was a Hertz pre-doctoral and doctoral Fellow.

Pat Fitch

Patrick Fitch

Associate Laboratory Director, Chemical, Earth and Life Sciences

Patrick (Pat) Fitch serves as the Associate Laboratory Director, Chemical, Earth and Life Sciences for Los Alamos National Laboratory. Most recently, Pat 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.

Bret Simpkins

Irene Qualters

Associate Laboratory Director, Simulation and Computation

Irene Qualters serves as the Associate Laboratory Director for Simulation and Computation. She currently serves as a Senior Science Advisor in the Computing and Information Science and Engineering (CISE) Directorate of the National Science Foundation (NSF), where she contributes to strategic leadership in new directions for the CISE Directorate. In her nearly nine years at NSF, she has had responsibility for developing NSF’s vision and portfolio of investments in high performance computing, and has played a leadership role in interagency, industry, and academic engagements to advance computing. Irene also served on the Science and Technology Committee of the LLNS/LANS Board of Governors. Prior to her NSF career, Irene had a distinguished 30-year career in industry, with a number of executive leadership positions in research and development in the technology sector. During her 20 years at Cray Research, she was a pioneer in the development of high performance parallel processing technologies to accelerate scientific discovery. Subsequently as Vice President, she led Information Systems for Merck Research Labs, focusing on international cyberinfrastructure to advance all phases of pharmaceutical R&D. Irene has a M.S. in Computer Science from the University of Detroit and a B.S. from Duquesne University.

Kathye Segala

Mark Anthony

Associate Laboratory Director for Plutonium Infrastructure (ALDPI)

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.

Michael Hazen

Michael Hazen

Associate Laboratory Director, Environment, Safety, Health & Quality and Safeguards and Security (ESHQSS)

Michael Hazen serves as the Associate Laboratory Director, Environment, Safety, Health & Quality and Safeguards & Security (ESHQSS) for Los Alamos National Laboratory. Michael served as Vice President of Infrastructure Operations and Chief Security Officer at Sandia National Laboratories where he had responsibility for Facilities, Safeguards and Security, Emergency Management and Environment, Safety and Health. Prior to joining Sandia, he served in the Air Force for more than 31 years, retiring as a Colonel. His first Air Force assignment was as a SAC enlisted Security Policeman and he finished his military career as the Director of Security for Space Command, responsible for the safeguards and security of the ICBM fleet. He held various staff assignments and commanded a Wing (Base), Group and 3 Squadrons. Michael earned a Fellowship at MIT, Seminar XXI, M.A in Public Administration from Golden Gate University, and a B.S. in Management from the University of Maryland. He also attended, in residence, the Air War College and the Air Command and Staff College.

LeAnne Stribley

LeAnne Stribley

Associate Laboratory Director, Business Management

LeAnne Stribley serves as the Associate Laboratory Director, Business Management for Los Alamos National Laboratory. She has more than 35 years of multi-industry experience building and leading the finance, accounting, procurement, IT, and administration functions of public, private and nonprofit entities. Most recently, LeAnne worked at Oak Ridge National Laboratory as Director of Contracts. She also served as ORNL’s Controller and Director for Accounting Services. Before joining ORNL, LeAnne was the Executive Vice President for Administration and Senior Vice President for Finance and Controller with the Tennessee Valley Authority. In each of these roles, LeAnne focused on continuous improvement of service levels in support of mission organizations. LeAnne was very active in the Knoxville community, serving on multiple Boards, including Child and Family Tennessee (Board Chair), Knoxville Tourism Corp  (Treasurer), Leadership Knoxville, The Central Business Improvement District (Treasurer), YWCA, and as Chair of the Smoky Mountain Region Combined Federal Campaign. She has a B.B.A. in Accounting from Texas Wesleyan University and is a licensed C.P.A.

Bret Simpkins

Bret Simpkins

Associate Laboratory Director, Facilities and Operations

Bret Simpkins serves as the Associate Laboratory Director for Facilities and Operations at Los Alamos National Laboratory. Since 2014, Bret has been 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.