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Sean McClellan, Ph.D. is a mixed-methods researcher with over a decade of experience in full cycle health services research. He has experience managing research projects, developing analytic designs, cleaning and analyzing administrative data, fielding rigorous surveys, conducting qualitative interviews, and communicating findings in plain language.

Jessica is a qualified international and community development practitioner with over 25 years of experience working in development in Southeast Asia, the Pacific and Australia. She holds a Bachelor of Asian Studies, Master of International and Community Development and a Graduate Certificate in Gender Policy and Mainstreaming. Jessica’s experience includes working with government, donors, multilaterals, the private sector, managing contractors and NGOs. 

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

Adam Schaefer has over 16 years’ experience developing and managing environmental epidemiology research and evaluation projects. He is an expert in the health impacts of environmental exposures and has worked on both national and international projects, focusing on infectious disease, toxicology, health surveillance, and One Health. Before coming to Abt, Schaefer was a researcher at Florida Atlantic University. He has published numerous epidemiological studies in peer-reviewed journals.

T.J. Pepping is an environmental scientist with 13 years of experience working in the intersection of data analysis and communication, helping clients interpret environmental data and share important information with the public. 

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.

Colleen Grogan Moore has over 30 years of experience implementing community development and housing-based programs in collaboration with state and local governments and nonprofit organizations. She has expertise in providing technical assistance (TA) and training, including to recipients of Department of Housing and Urban Development (HUD) community development, housing, and homeless program funding. She has experience building strong relationships with state and local program grantees and managers and supporting communities in effectively using resources.

Matthew Eby has over 20 years of leadership experience in supporting life science research and consulting for military, federal public health, and international agencies. His diverse career spans basic and applied research on environmental bioremediation, designing nanomaterials to combat antimicrobial resistance, and protecting our nation against bioterrorism. He also led federal and international agencies in modernizing public health systems and pandemic response efforts. Clients have included the Air Force, Navy, Army, Defense Advanced Research Projects Agency, Centers for Disease Control and Prevention (CDC), Food and Drug Administration, National Institutes of Health, and United Arab Emirates. He  has authored more than 20 peer-reviewed publications with 1000+ citations. He also is an active supporter of local community initiatives that tackle affordable housing, food insecurity, and systemic poverty.

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.