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Natalie Matthews has over 15 years of experience in the field of homelessness, with a focus on direct service, system planning, database administration, and technical assistance and implementation (TA). Since joining Abt in 2009, Matthews has served in a variety of roles on its U.S. Department of Housing and Urban Development (HUD) Community Compass TA cooperative agreements. She’s also worked on several locally and U.S. Department of Veterans Affairs (VA)-funded TA projects, as well as research, monitoring and evaluation projects.  She served as the project director for the VA’s Supportive Services for Veteran Families (SSVF) monitoring project, served on the evaluation team for HUD’s first evaluation of rapid re-housing programs for families (2012), and led the evaluation of Hartford Connecticut’s homelessness prevention and rapid re-housing program (2014).

Rodrigue Fiacre Ahoumènou Agossa is a public health entomologist with more than 12 years of experience in control and elimination of infectious diseases, particularly malaria control programs. His expertise includes project management; research; vector control tools development and evaluation; case management; and health system strengthening. He also has worked on development, consolidation, and popularization of norms, policies, and guidelines for the fight against malaria and neglected tropical diseases. He has collaborated with the Global Fund, World Health Organization, Against Malaria Foundation, and Ministry of Health.

Nichole Fiore is a Principal Associate with over 15 years of experience evaluating housing and homelessness programs across the country, developing deep expertise on homeless service systems, organizational capacity, political and community will, unsheltered homelessness, and permanent supportive housing. Recognizing the critical link between stable, safe housing and overall well-being, Fiore is proven leader bringing together stakeholders who work across many jurisdictions and sectors to address the needs and improve the lives of people experiencing homelessness. She is a regular source for media outlets, often on the topic of homelessness in California.

Radha Roy is a mixed-methods researcher and senior evaluation leader with over 16 years of experience designing and directing large-scale federal evaluations of workforce development, income support, and education programs.

Melanie Metropolit is a public health strategist with more than 20 years of experience across federal health, research, and international development initiatives.

Jennifer S. Riggs, Ph.D., brings her extensive research, policy, and nursing experience to improve care for patients, especially older adults. Her clinical area of expertise is Medicare-certified home health and home and community-based care for adults and older adults with multiple co-occurring chronic conditions and complex care coordination needs.

Douglas W. Elmendorf, Ph.D., is Lucius N. Littauer Professor of Public Policy at Harvard University’s John F. Kennedy School of Government. He served as Dean of the Kennedy School from 2016 to 2024 and was previously Director of the Congressional Budget Office from 2009 to 2015.Elmendorf has held senior economic positions with the Federal Reserve Board, the President’s Council of Economic Advisers, and the Treasury Department, where he was Deputy Assistant Secretary for Economic Policy. He is a widely respected economist who has deep knowledge of many of Abt’s core research areas, including health care policy and approaches to increasing economic security.Elmendorf is the author of more than 30 publications and has testified before Congress on economic issues 50 times since 2005. 

Lauren Pittenger comes to Abt with more than 20 years of experience working in or as a consultant to federal government agencies. She has strong grounding in research and research-based consulting to government clients. She also has extensive experience leading and growing business, managing technical and scientific projects, and coaching and supporting account teams. She has served as a director at Guidehouse, scientific program manager at Booz Allen Hamilton, and lab manager at the U.S. Department of Agriculture. She has worked with the Centers for Disease Control and Prevention (CDC), Food and Drug Administration (FDA), the Canadian Public Health Laboratory Network, the Gates Foundation and the Association of Public Health Laboratories.

Lisanne F. Brown has more than 20 years of experience in public health evaluation and research and a background in epidemiologic and program evaluation methods. She has worked on numerous evaluation and applied research studies for local, state and federal agencies. Her areas of expertise include maternal and child health, health care access, integration of primary care and behavioral health, community-centered health homes, social determinants of health, mixed methods evaluation design and implementation, survey design, and evaluation capacity building.