About Us

OPA Staff

George Santangelo, Ph.D.

George’s background is in genomics and data science. He received his bachelor's degree from the University of Pennsylvania, and his doctorate from Yale University. In 2011, George was appointed as Director of the newly formed Office of Portfolio Analysis in DPCPSI, and now leads a team of analysts, data scientists, and software developers to enable data-driven decision-making.

How to reach George:
Phone: 301-496-5006
Send Dr. Santangelo an email

Sharon Chaney, B.A.
Staff Assistant

Sharon is a Communications professional with 28 years of experience at NIH. She provides the Office with expert administrative support and invaluable institutional knowledge of NIH.  She is the primary contact for OPA and secretary for Dr. Santangelo.  She handles all administrative issues in order to keep the Office moving forward.

How to reach Sharon:
Phone: 301-496-2987
Send Sharon an email

Katrina Bibb, M.P.H.
Scientific Analyst

Katrina's background is in biology, public health, and global health. She received her M.P.H. and Certificate in Global Health from the University of Maryland, College Park in 2017. She has experience in quantitative and qualitative data analyses, specifically related to environmental epidemiology and health disparities. Katrina has performed a variety of analyses within the NIH including metric development, impact and statistical analyses.

How to reach Katrina:
Send Katrina an email

Brad Busse, Ph.D.
Data Scientist

With a background that bridges the gap between computer science and biology, Brad brings extensive experience in scientific computing, image analysis and algorithm development to OPA. He is proficient in a number of development environments but prefers Python for its deep learning and scientific processing libraries. Prior to joining OPA, Brad was a Postdoctoral Fellow in the National Institute for Child Health and Human Development, where he was responsible for tasks ranging from application development to machine learning. Brad received his Ph.D. in Biophysics from Stanford University and his B.S. in Computer Engineering from Texas A&M University.

How to reach Brad:
Phone: 301-402-7711
Send Brad an email

Krista Callender M.B.A.
IT Project Manager

Krista joined OPA in November 2020, bringing leadership and project management experience. Prior to joining OPA, she built and led the operations functions for Companion Protect, LLC. Krista has held leadership positions with Asurion, Elastic Networks, and Nortel Networks, in addition to founding Trade Winds Consulting. She has managed large organizations of diverse professionals in multiple locations domestically and internationally, leading teams responsible for the delivery of complex, cross-functional projects and programs. Krista received her Bachelor of Science degree in Electrical Engineering from North Carolina State University, and her Masters of Business Administration from Kenan-Flagler’s Executive MBA program. She also holds a Project Management Professional Certification.

How to reach Krista:
Send Krista an email

Marina Dathe, M.P.H.
Scientific Analyst

Marina joined OPA in 2017, bringing expertise in behavioral research to the office. Prior to joining OPA, Marina spent three years as a Cancer Research Training Award Fellow at the National Cancer Institute, where she collaborated with scientific staff on program evaluation initiatives and developed a data mining interface to enable the rapid processing and coding of large amounts of data for curation and cleaning. Within the office, Marina uses her experience to gather and analyze NIH-funded research. Marina holds an M.P.H. in Behavioral and Community Health from University of Maryland, College Park.

How to reach Marina:
Phone: 301-402-3162
Send Marina an email

Matt Davis, M.S.
Software Engineer

Matt's background is in software engineering with a focus on natural language processing, information retrieval, and machine learning. At OPA, he works on the development of a variety web applications, web services, and batch computations. Typical projects include citation resolution and linking, classifying grants via machine learning, and working on the iSearch web application.​

How to reach Matt:
Phone: 301-452-5131​
Send Matt an email

Shannon Davis
Data Scientist

Shannon's academic background is in international political science, English, and biology. She supports the software development team testing iSearch applications and writing documentation.

How to reach Shannon:
Phone: 301-827-5941
Send Shannon an email

Paula Fearon, Ph.D.
Project Manager

Paula is our training program director, an analyst, and a problem solver with a background in biochemistry and cell biology. She provides guidance in the use of portfolio analysis methods and tools, and consults with NIH staff to find effective solutions to their portfolio analysis questions. Paula is typically involved in trans-NIH analyses, training activities, and coordinating the use of OPA tools across NIH. ​

How to reach Paula:
Phone: 301-496-5663
Send Paula an email

Ehsanul (Ehsan) Haque, M.S.
Bioinformatics Programmer

Ehsan’s background is in programming. At OPA he develops specialized software for synthesizing large volumes of qualitative scientific information. Ehsan’s programs aim to extract useful information about NIH research programs that can be used to support programmatic decision making. ​

How to reach Ehsan:
Phone: 301-496-6121
Send Ehsan an email

Rob Harriman, M.S.
Program and Data Analyst

Rob’s degree is in Biotechnology but his primary role at OPA is developing new data sources for the office. He has worked building enhanced patent and Microsoft academic graph databases, creating automated methods linking source data like patents to existing NIH and other agency grants by mining the federal support sections. Rob is depended on to conduct portfolio analyses and support data collection and data cleansing for other analysts in our office.

How to reach Rob:
Phone: 301-594-4873
Send Rob an email

Grant Jones, Ph.D.
Health Science Policy Analyst

Grant is a biochemist by training, with a diverse background studying human virology, toxic marine algae, and protein translation. He uses his experience with genomics and computer programming to analyze large-scale datasets and present his findings using clear, concise graphics and figures. His work within the OPA is focused on comparing scientific portfolios as well as developing new tools to enhance data-driven decision making by NIH leadership. ​

How to reach Grant:
Phone: 301-402-9568
Send Grant an email

Emily Lampe
UX/UI Designer

Emily joined OPA in 2021, bringing 7 years of 3D conceptual design experience. Paired with her human-centered design approach, she curates exceptional experiences and visual design by fusing the client's vision with the users' unarticulated needs. Emily earned her B.S. in Interior Design from Oklahoma State University.​

How to reach Emily:
Phone: 301-496-5663
Send Emily an email

Aviva Litovitz, Ph.D.
Senior Policy Analyst

Aviva brings a background in Chemistry and Public Policy Analysis to OPA to strengthen our capacity in research design, data gathering and compilation, statistical analysis, econometric modeling, and network analysis. She performs analysis and evaluation for NIH senior leadership and develops methodology for NIH-wide cost per publication estimates. Aviva is currently initiating an effort to situate the NIH within the broader context of biomedical research funding. ​

How to reach Aviva:
Phone: 301-496-8388
Send Aviva an email

Merricka Livingstone, Ph.D.
Scientific Portfolio Analyst

Merricka joined OPA as a scientific portfolio analyst in 2020, bringing a broad background in chemistry, toxicology, and biomedical science. Previously, she was an NRC Research Associate at Walter Reed Army Institute of Research, developing antibody-based therapies for malaria. Merricka earned her B.S. in Chemistry from Massachusetts Institute of Technology and her Ph.D. in Environmental Health, concentrating in Molecular and Translational Toxicology from Johns Hopkins University.​

How to reach Merricka:
Phone: 321-258-8726
Send Merricka an email

Gabriel Lopez
Software Developer

Gabriel joined OPA in July of 2019 as a Software Developer with a concentration in web development and big data processing. Prior to joining OPA, Gabriel worked extensively with web applications designed to derive significant conclusions from large datasets. He earned his B.S. in Computer Science from Columbia University. Currently, Gabriel is focused on java web application development. ​

How to reach Gabriel:
Phone: 202-643-3188
Send Gabriel an email

Chuck Lynch, Ph.D.
IT Specialist and Information Scientist

Chuck is a graduate of the U.S. Air Force Academy with a background in mechanical engineering, systems engineering and information technology. At OPA he is primarily responsible for specifying, acquiring, and implementing OPA IT infrastructure, adding computational and storage capacity. A recent success was the design and implementation of a complex computing environment (a five server, 150TB Hadoop Computing Cluster) in just six months, with the help of OIT, while the average implementation time is 18 months. ​

How to reach Chuck:
Phone: 301-594-1839
Send Chuck an email

Rebecca Meseroll, Ph.D.
Health Science Policy Analyst

Rebecca’s background is in cell biology, genetics, and biochemistry, with a long-standing interest in science communications. She brings her science writing and editing expertise to OPA, where she prepares data analyses and other developments from the office for external consumption in the form of presentations and written reports. In addition to communicating about OPA, Rebecca performs portfolio analyses to support programmatic decision-making across the NIH. 

How to reach Rebecca:
Phone: 301-594-7357
Send Rebecca an email

Payam Meyer, M.S.
Software Engineer

Payam’s background is in software engineering and data systems. Payam is integral to the collaborative work between OPA and ODP involving the development of an advanced machine learning architecture to efficiently classify prevention research across the NIH portfolio. He also contributes to the development of iSearch as well as assisting OPA teammates with their day-to-day data and analytics needs.

How to reach Payam:
Phone: 301-594-4856
Send Payam an email

Will Millman
Software Architect

Will joined the Office of Portfolio Analysis as a software architect in 2019 after spending over ten years at ProQuest specializing in developing and managing large-scale biomedical content and MeSH indexing solutions for the life sciences. At the OPA, Will collaborates for design, document, and build new versions of the Portfolio Analysis applications produced.

How to reach Will:
Phone: 301-496-5663
Send Will an email

Matt Perkins
Training Director and Science Analyst

Matt has a background in mathematics and statistics and has previously spent 14 years working for the Government Statistical Service in the United Kingdom. Matt works as a statistical portfolio analyst and is the director of the OPA Portfolio Analysis Training Program. In this role, Matt assists analysts across the NIH with the use of PA tools, particularly iSearch (OPA's portfolio analysis search tool). In addition, he is responsible for the coordination of the OPA Portfolio Analysis consultation service.

How to reach Matt:
Phone: 301-594-4838
Send Matt an email

Josh Seideman
Scientific Portfolio Analyst

Josh has a background in biology, with a focus on neuroscience and behavioral science. Prior to joining OPA, Josh worked as a biomedical research scientist for over a decade. During this time, he conducted neuroscience investigations at the cellular and systems levels, using empirical as well as theoretical methods (i.e. computer simulations). He earned his Ph.D. from Wake Forest University and a B.A. from Boston University.

How to reach Josh:
Phone: 202-643-4739
Send Josh an email

Esha Sinha, Ph.D.
Science Analyst

Esha is a Scientific Portfolio Analyst/Economist at Office of Portfolio Analysis. At OPA she carries out analyses of NIH funded research to inform decision making. Before joining OPA, she worked at the National Academies where she organized panel studies and workshops, as well as contributing to analysis. She previously co-directed a study evaluating the commercial motor vehicle safety ranking program of the U.S. Department of Transportation. She earned her M.A. in economics from GIPE, India, and worked for a year as research assistant in the Indian Institute of Management, Ahmedabad, before attending SUNY Binghamton where she completed her Ph.D. in economics.​

How to reach Esha:
Phone: 301-594-0319
Send Esha an email

Lisa Strauss
Program Analyst

Lisa Strauss joined OPA in 2017 as a Program Analyst. She serves in an administrative capacity using her experience as a budget analyst, COR, and administrator. Lisa has been at NIH for 35 years working in both the Clinical Center and the National Institute of Nursing Research. Prior to her career at NIH, she worked in ambulatory care as a Certified Medical Assistant. She has a degree in Health Care Management.

How to reach Lisa:
Phone: 301-496-8547
Send Lisa an email

Hashi Wijayatilake
Senior Policy Analyst

Hashi joined the OPA in 2020, bringing 10 years of experience in science publishing, first at the Cold Spring Harbor Laboratory Press (NY) and then at PLOS. As Managing Editor of PLOS Biology, she led the journal team in publishing high-profile research content, and implementing open science initiatives and publishing innovations. Hashi’s experience in publishing and research reproducibility initiatives will be leveraged in portfolio analysis and metrics, as researchers worldwide look to generate a culture change towards best research practices. Hashi received her Bachelor of Arts in Molecular Biology from Princeton University, and her DPhil (PhD) from the University of Oxford (UK).

How to reach Hashi:
Phone: 202-643-4739
Send Hashi an email






Lucas Winch
Software Developer

Joining OPA in 2019, Lucas brings experience in web development, super-computing, and scientific computing. Lucas leverages these skills to build a diverse set of software resources and classify research within the NIH portfolio. Prior to joining NIH, Lucas earned his B.S. in Computer Science from Johns Hopkins University and created systems models within the Johns Hopkins School of Public Health.

How to reach Lucas:
Phone: 301-496-5663
Send Lucas an email

Tom Xu, M.S., Ph.D.
Software Developer

Tom joined OPA in November 2017 as a Software Developer. Tom’s background is in quantum physics and computer science. He earned his Ph.D. in physics from the Chinese Academy of Sciences, and went on to acquire an M.S. in computer science from the Georgia Institute of Technology. Tom has substantial experience in scientific programming, simulations, and modeling. His current focus is on Java web application development, data analysis, and deep learning.

How to reach Tom:
Phone: 301-827-5942
Send Tom an email

Hao Yu, M.S., Ph.D.
Software Developer/Data Scientist

Hao has a unique background in biomedical research and computer science. She earned her PhD in Cell Biology from University of Miami and MS in Computer Science from JHU. She works as part of the software development team for web applications such as iSearch with a focus on Java programming and information retrieval to improve the tools that are designed for portfolio analysis. She is also extensively involved in algorithm development, using her knowledge and skills in machine learning and natural language processing, to help the office with portfolio and content analysis.

How to reach Hao:
Phone: 301-496-3918
Send Hao an email

This page last reviewed on January 14, 2021