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Sarah Kozyn is an international agriculture and economic growth specialist with more than 12 years of experience designing, managing, monitoring, and evaluating donor-funded programs focused on agriculture and market systems development, resilience, nutrition, and trade. Her work at Abt has spanned projects in sub-Saharan Africa (Uganda, Ghana), the Middle East and North Africa (Egypt), and South and Southeast Asia (Bangladesh, Cambodia). 

For 15 years, Lauren Dunton has been working in homelessness, housing, workforce, and education research at Abt. As an experienced Project Director, Dunton manages research and technical assistance projects for a range of federal agencies and foundation clients. She has expertise in qualitative data collection and analysis, including coordinating and conducting site visits and managing the collection of site-level administrative data.

Dr. Karen Stein is a lead survey methodologist with more than 15 years of research experience designing and pretesting surveys, conducting qualitative studies, and managing projects and programs. She has overseen teams designing and implementing methodologies, including 1:1 interviews, usability testing, and data analysis. She has made recommendations to major clients such as the Food and Drug Administration (FDA), Centers for Disease Control and Prevention, Census Bureau, Food and Nutrition Service, Internal Revenue Service, Bureau of Labor Statistics, and Department of Justice (DOJ).

Meryl Finkel leads Abt Global’s Housing and Communities Practice, overseeing large-scale housing; community and economic development; and social policy data collection, analysis and technical assistance projects. Clients include the U.S. Department of Housing and Urban Development, Consumer Financial Protection Bureau, and Corporation for National and Community Service, as well as foundations and state and local governments.

Dr. Tiffany G. Harris is an epidemiologist with over 20 years of experience working in public health. She has overseen surveillance, program implementation and management, monitoring and evaluation, informatics, and data analysis and dissemination at the local, federal, and international level. She focuses on HIV, tuberculosis, COVID-19, and other infectious and non-infectious diseases.

Since 2011, Dr. Anna Jefferson has spent her career in policy research creatively and rigorously applying ethnographic, participatory, and community-based methods to make policy research more person-centered. She is a subject matter expert in guaranteed income, inequality, consumer finance, and U.S. housing policy, and a fluent Spanish speaker. She co-leads Abt’s portfolio of guaranteed income evaluations and has worked extensively with the Consumer Financial Protection Bureau, Department of Housing and Urban Development, New York City Mayor’s Office of Economic Opportunity, and a range of philanthropic clients. Dr. Jefferson is an experienced principal investigator, project director and task leader, and co-leads Abt's qualitative and mixed methods affinity group. 

Donna DeMarco has more than 30 years of experience successfully designing and managing research studies on a variety of federal, state, and local programs targeted to lower income individuals and families. She has experience with program evaluation and policy analysis in a wide variety of fields, including asset building, community and economic development, housing, family development, education, job training, and community services. She has expertise in the implementation of qualitative research and data collection for large-scale, multi-modal, experimental research projects.

Eduardo Castellon has two decades of experience helping public sector clients—from the U.S. Agency for International Development (USAID) and the U.S. Postal Service (USPS) to the Department of Housing and Urban Development—grow and refine their operations and impact. He has extensive experience delivering consulting expertise focused on artificial intelligence (AI), supply chain, procurement, financial management, and advanced analytics. His technological, consultative, and entrepreneurial skills help clients find new ways to address challenges ranging from affordable housing to homelessness to guaranteed income. He also has extensive expertise in technical assistance and implementation (TA&I) approaches. And his management experience includes developing high-performing teams through skills and career development and succession planning.

Dereje Dengela is an epidemiologist and entomologist with more than 25 years of experience in planning, implementation, monitoring, and evaluation of malaria control programs. He has extensive managerial experience, having supervised as many as 94 professionals. He has held senior positions with the government of Ethiopia, worked on projects for the U.S. Agency for International Development (USAID), and worked for the World Health Organization (WHO) as national malaria program officer in Ethiopia. While at the WHO, he supported the Ministry of Health of Ethiopia in mobilization of financial resources from donors, particularly the Global Fund. Dengela has authored or co-authored more than 30 publications in peer-reviewed journals.