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Katharine Witgert is a health policy researcher with 20 years of public health and health care policy experience. Witgert manages research and analysis of health system innovations, conducting program evaluations for federal clients, including design, implementation, and reporting of findings. She provides technical assistance to state officials, primarily in the areas of Medicaid reforms and building Medicaid agency partnerships with public health, behavioral health, and social services programs.

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.

Daniel Gubits conducts research in the areas of housing, homelessness, economic self-sufficiency and disability policy. Gubits’ expertise is in econometric modeling, data analysis, and random assignment program evaluation.Gubits serves as the director of analysis for the Family Options Study, conducted for the U.S. Department of Housing and Urban Development (HUD). He is also leading the impact analysis work for the Social Security Administration’s Benefit Offset National Demonstration (BOND) project. Both of these are random assignment impact evaluations.

William Tuleu leads strategic growth initiatives across the company's U.S. foreign assistance and domestic portfolios.

Mariandrea Chamorro has 20 years of experience managing international development programs. She has provided oversight for the high-quality and compliant execution of large flagship USAID programs while contributing to business development. Chamorro’s areas of expertise include prevention of vector-borne diseases, infectious diseases, maternal and child health, and health systems strengthening. Her clients have included the U.S. Agency for International Development (USAID), the Australian Department of Foreign Affairs and Trade (DFAT), and the UK’s Foreign Commonwealth & Development Office (FCDO). 

Alan White is a nationally renowned health economist, highly respected for his rapid response to clients’ complex information and research needs with data-driven, creative solutions. As the senior health economist for the Health Policy Practice, he leads high-profile projects and guides the practice’s health economists.

Teresa Mota, BSN, RN is an Associate/Nurse Researcher and a sought-after clinical researcher on federal and state projects emphasizing aging, long-term care, and improving the care experience. Mota has an extensive clinical and health services research background in geriatric nursing, and she specializes in post-acute care, quality improvement (QI) and supporting community-based providers and stakeholders to assist them in the identification of best-practices, develop resources and tools, communications, and implementation of QI initiatives. Mota also participates in data collection, measurement, analysis, and reporting related to these programs.

Graham Teskey leads Abt Global’s Global Governance practice out of Canberra, Australia. He has 40 years of experience in governance and international development. He has worked with (and for) for the U.K.’s Department for International Development, (the forerunner to the Foreign, Commonwealth and Development Office), the World Bank, and Australia’s Department of Foreign Affairs and Trade. Graham has lived and worked in multiple countries, including Kenya, Tanzania, Uganda, Rwanda, Zambia, Zimbabwe, Malawi, Fiji, Vanuatu, Indonesia, Papua New Guinea, Solomon Islands, Philippines, and Timor-Leste.