About Us
dataindex.us is a collaborative effort dedicated to monitoring changes in federal datasets. Our team is building tools to track a broad range of changes in federal datasets to build actionable insights for policymakers, advocates, journalists, and data users.
The Core Team
Former U.S. Chief Data Scientist
Denice's mission is to build a more resilient national data infrastructure. Most recently, she served as the Deputy U.S. Chief Technology Officer and as the U.S. Chief Data Scientist, where she led the charge to use disaggregated data to drive better outcomes for all Americans. Denice's 25-year career using data to serve the public interest has spanned federal and local government, academia, and the nonprofit sector plus domains ranging from climate to policing.
Former Chief, Population Evaluation, Analysis & Projections Branch, United States Census Bureau
Chris' mission is to ensure the provision of essential data for the betterment of all. Chris' 15 year career has included work in the federal government, the private sector, and as a consultant to federal, state, and local governments as well as non-profit organizations. As a demographer and data scientist, his work has always centered on the development and use of data to engage and serve the public.
Amanda is a data and computational scientist who has addressed challenges across multiple domains over a 20-year career. As a committed proponent of data accessibility, she has brought her technical expertise to both the private sector and public interest initiatives. Her work has informed policy decisions, supported advocacy efforts, advanced scientific research, and created solutions that improve outcomes across commercial, educational, and civic spaces.
Beth has 25 years of experience in demographic and socioeconomic analysis to support public policy. She has expertise in the decennial census, American Community Survey, and indicators of health and well-being. She is active in the federal statistical community and has a long history of working with California data (from both state and federal sources) across a wide variety of subjects ranging from air quality to school enrollment to industry employment.
Ben is a web developer and recent graduate from the University of Pittsburgh with a degree in Computer Science and Human-Centered Design. He’s interested in designing engaging, accessible websites for government and non-profit organizations. While working with Pittsburgh’s local government, Ben developed a foundation in data governance and improving public access to open data.
Melanie is an emerging data scientist passionate about leveraging data for positive social impact and promoting responsible data governance. She has gained valuable experience through internships in the executive and legislative branches, academia, and the nonprofit sector. As a 2025 graduate of American University and a Public Policy and International Affairs Fellow, Melanie’s studies focus on the intersection of data, technology, and policy.
Subject Matter Experts
Former White House Official
Christopher Steven Marcum, Ph.D., is a Senior Advisor for Federal Data Policy at the Federation of American Scientists. An open science leader with over 80 scholarly publications, he works on information policy and data governance for projects like dataindex.us and essentialdata.us. He formerly served as Assistant Director for Open Science and Data Policy in the White House OSTP, as well as Senior Statistician and Senior Scientist in the White House OMB.
EJScreen and Tools Team Lead, Office of Environmental Justice and External Civil Rights, US EPA
Tai Lung is an environmental policy, data, and mapping leader with more than 20 years of experience advancing environmental protection. He led EJScreen, EPA's flagship environmental justice screening and mapping tool, for more than a decade until the Office of Environmental Justice closed in 2025. He now co-leads the nonprofit Environmental & Health Data Analysis Trust (EHDAT), developing open, science-based environmental and health data tools to support decision-making by governments, researchers, and communities.
Former Behavioral Scientist at CDC’s National Center for Injury Prevention and Control
Vi D. Le has built her career around strengthening how government uses data to serve the public, with a focus on public health. Most recently, she was a Behavioral Scientist at CDC's Division of Violence Prevention, directing research, evaluations, and technical assistance to improve violence prevention outcomes nationwide. Her work has brought together federal, state, and local government, research institutions, and community-based organizations, spanning issues from intimate partner violence to technology-facilitated violence.
Past Contributors
Brian is a civic technologist with a background in programming and data analysis. Most recently, he was a U.S. Digital Corps Fellow, but his prior experience includes work in public health, transportation, and public policy across the federal, academic, and private sectors. He’s passionate about data accessibility and transparency.
Bryan is a data scientist and technologist with ten years of experience working with data, statistics, and programming in the federal government and adjacent sectors. As a researcher and consultant, he has seen firsthand the value and power of US federal data, both internally and to the public. As a product manager and user advocate, his efforts focus on making data as useful as possible for the people and groups who need it most.
Taylor is a policy and research analyst specializing in census data and its impact on governance, representation, and resource allocation. Passionate about the power of high-quality, timely public data in shaping informed decision-making and addressing the needs of communities nationwide, her work in both the academic and nonprofit sectors has included research and analysis to inform policy decisions and support civic initiatives and institutions.
Contact Us
Have questions or feedback about our data monitoring efforts? We'd love to hear from you!