Phil Hagan

Phil Hagan, J.D., M.B.A., M.P.H.

Director of Graduate Studies
Assistant Professor, Department of Human Science


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Metrology Lab Director


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Administrative Manager



Department of Chemistry Faculty

Dr.  YuYe Tong is a Professor in the Department of Chemistry and the Program Director of Environmental Metrology & Policy. He is an expert in Analytical Chemistry, Physical Electrochemistry, in situ Spectroelectrochemistry, the synthesis of metal-based nanomaterials, and fuel-cell related electrocatalysis and clean energy science

Steven Metallo

Steven Metallo, Ph.D.
Associate Professor

Associate Professor, Department of Chemistry

Sarah Stoll

Sarah Stoll, Ph.D
Associate Professor

Associate Professor, Department of Chemistry


Department of Human Science Faculty

Phil Hagan is the Associate Director for Environmental Metrology & Policy Program.   In addition to teaching at Georgetown University, Phil Hagan is a managing partner with Omyx Law, a law firm that practices in the business arena.  He is also on the DC Department of Health Environmental Public Health Tracking Advisory Committee, the Editorial Advisory Board for the National Safety Council Technical Publication Committee and past Editorial Board member and peer reviewer for the Journal of Applied Biosafety. Recently, he worked with the US Department of Education on updating the safety and emergency provisions of the Higher Education Opportunities Act – specifically, the Jeanne Clery Act - (originally known as the Crime Awareness and Campus Security Act of 1990)

Rosemary Sokas is chair of the Department of Human Science at the Georgetown University School of Nursing and Health Studies.  Her publications address the role primary care providers play in addressing the prevention needs of under-served working populations, and etiologic and intervention studies targeting hazards faced by construction workers, healthcare workers, immigrant day labor and home care workers, including the impact of contingent work and the need for supply chain and other policy interventions.


Department of Microbiology & Immunology

A. Alan Mohhissi is an adjunt professor in the Biomedical Graduate Education Program.


A sign reading National Institutes of Standards and Technology in a landscaped garden space at the NIST Gaithersburg, Maryland campus.


Carlos Gonzalez, Ph.D., Chief, Chemical Sciences Division

Dr. Gonzalez joined NIST in 1997 as a member of the Computational Chemistry Group within the Physical and Chemical Properties Division. Dr. Gonzalez was appointed to the position of Chief, Chemical and Biochemical Reference Data Division in 2008. In 2012, Dr. Gonzalez was appointed to the position of Chief, Chemical Sciences Division.

Katrice Lippa, Ph.D., Scientific Advisor, Chemical Sciences Division

Dr. Katrice Lippa presently serves as the group leader of the Organic Chemical Measurement Science Group. Before that, she was Scientific Advisor for the Chemical Sciences Division to develop and promote reference material and data products together with chemical informatics tools that will span and connect divisional project areas (clinical, metabolomics, forensics, environmental and chemical manufacturing). She also represents NIST in the InterAmerican Metrology System (SIM) and the Consultative Committee for Amount of Substance-Metrology in Chemistry (CCQM) to develop metrology tools for traceability and to establish equivalence among measurements made by national metrology institutes (NMIs). Her current research directions are in quantitative NMR techniques for the characterization of pure substances as well as organic constituents in biological and natural matrices, in addition to advancing metrologically-sound methods for ensuring chemical traceability. As a research analytical chemist, Katrice has extensive experience in trace-level environmental organic measurement techniques (chromatography-mass spectrometry) and implementation of structure-reactivity/molecular modeling tools to help solve chemical measurement problems.

Jeanita Pritchett, Ph.D., Research Chemist

Dr. Jeanita Pritchett is a research chemist in the Chemical Sciences Division and an adjunct chemistry lecturer at Montgomery College. Jeanita is actively involved educational outreach activities, and has served as a U.S. Embassy Science fellow at Scifest Africa (South Africa’s largest national science festival) where she developed and presented interactive STEM-related workshops. Her research focuses on clinical chemistry and the metrology of drug analysis in consumer products and forensic applications.

Antonio Possolo, Ph.D., NIST Fellow

Dr. Antonio Possolo is a NIST Fellow and the Chief Statistician in the Statistical Engineering Division. Besides his current role at NIST, he has had over 20 years of experience as a statistician in industry (General Electric, Boeing) and as an assistant professor of statistics (Princeton University, and University of Washington). His areas of specialty include spatial statistics and modeling of spatio-temporal phenomena, environmental remote sensing, foundations of probability theory and of statistical inference, and measurement uncertainty. He is also fluent in Portuguese, Spanish, and French.

William Guthrie, M.S., Division Chief

William Guthrie is the Chief of the Statistical Engineering Division. For over 25 years, he has collaborated with NIST scientists and engineers to apply statistical methods to solve problems in semiconductor and microelectronic metrology, building materials research, and chemical metrology. His statistical interests include uncertainty assessment, Bayesian statistics, design of experiments, calibration, modern regression methods, and statistical computation.

Adam L. Pintar, Ph.D., Research Statistician

Adam L. Pintar is a research statistician in the Statistical Engineering Division.He earned a B.S. in 2003 and M.S in 2004 in Mathematics from Pittsburg State University. He also earned a M.S. in 2007 and Ph.D. in 2010 in Statistics from Iowa State University. Adam has been a Mathematical Statistician with NIST's Statistical Engineering Division since October 12, 2010. He is also a member of the American Statistical Association and the American Society for Quality (ASQ), and is currently serving as the chair for the Statistics Division of the ASQ.  

U.S. Environmental Protection Agency sign in front of the Arial Rios headquarters building in Washington, DC


Carlos Gonzalez, Ph.D., Chief, Chemical Sciences Division

Dr. Kevin Teichman is the Senior Science Advisor in the Office of Research and Development (ORD) at the U.S. EPA. In addition to providing advice on all aspects of ORD’s research programs, he coordinates ORD’s research efforts with other Federal agencies and organizations. Most recently, he has been working to coordinate interagency research devoted to hydraulic fracturing, net zero environmental impact buildings, and applications and sensors for air pollutants. Prior to assuming his current position, he served as the ORD Deputy Assistant Administrator for Science, where he led the planning of ORD’s research program and supervised the office’s National Program Directors. The ORD research program covers all aspects of environmental research, including research devoted to air, climate, and energy; safe and sustainable water resources; chemical safety for sustainability; sustainable and healthy communities; human health risk assessment; and homeland security.

Ed Walsh, B.S.B.A., Senior Policy Advisor

Ed Walsh is the Senior Policy Advisor and Agency Liaison to Congressional Appropriations Committees, Office of the Chief Financial Officer, EPA. He has served as executive branch congressional affairs liaison through several different Presidential Administrations, demonstrated the ability to bring together recognized environmental experts with policymakers to develop solutions to problems, is a results-driven leader with approximately 20 years of demonstrated experience managing and coordinating people, process, and technology, and has proven capabilities leading and managing teams dedicated to the production and development of the Environmental Protection Agency’s Budget.

Babasaheb (Bob) R. Sonawane, Ph.D. (retired from EPA in 2016)

Dr. Sonawane has over 35 plus years research and management experience in toxicology and pharmacology and  cancer/ non-cancer health risk assessment of environmental pollutants.  He is a very well recognized expert in the fields of Toxicology and Risk Assessment of xenobiotics. He is an author and/or co-author of over 100 publications and several book chapters in the fields of toxicology and pharmacology, children's environmental health and risk assessment of xenobiotics.  Dr. Sonawane worked as a Toxicologist with the U.S. Food and Drug Administration (1983-1985),  He served as a Biologist (1985-1990), Branch Chief of Reproductive and Developmental Toxicology (1991-1995) and Group Chief of Effects Identification and Characterization (1995- 2015) of National Center for Environmental Assessment (NCEA), Office of Research and Development of EPA.  He served on details as the Group Chief to Quantitative Risk Methods Group (2015), Acting Deputy Director (1989), and Acting Director (1990) of NCEA Cincinnati and Washington Divisions. For his outstanding service, Dr. Sonawane has received numerous awards, including the most "Distinguished Career Service Award" and the "Distinguished Service Citation" by the  EPA Administrator in 2016.


The National Institute of Standards and Technology (NIST) is the Nation’s ultimate scientific authority in validating and upholding the state-of- the-art science of measurements – metrology. From the air and water quality, smart electric power grids to advanced nanomaterials, innumerable products and services rely in some way on technology, measurement, and standards provided by the National Institute of Standards and Technology.

The Environmental Protection Agency (EPA) is the primary agency of the United States federal government whose mission is to protect human and environmental health. The EPA is responsible for conducting environmental assessment, research and education to create and enforce standards and laws that promote the health of individuals and the environment.

Agilent Technologies (Agilent) is an American public research, development and manufacturing company. Agilent is a leader in life sciences, diagnostics and applied chemical markets. Focusing on six markets, food, environmental and forensics, pharmaceutical, diagnostics, chemical and energy, and research, the company provides analytical instruments, software, services and consumables for the entire laboratory value chain.