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Harold Poston has more than 25 years of experience in federal IT, with deep subject matter expertise across Health IT modernization, Defense Health Agency programs, and Army enterprise IT transformation. Poston leads Abt’s growth strategy for Military Health and VA, connecting federal clients to Abt’s capabilities in digital transformation, data services, and program modernization.

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.

Jane Pepperall is a senior health professional with over 30 years of experience in global health policy development and in supporting national health sector development in the Pacific, Asia, and Africa. She has focused on strategy and investments to strengthen health systems and health financing. Jane worked for the United Kingdom Department for International Development (DFID) (now the Foreign, Commonwealth and Development Office) for 20 years, including health adviser postings in Uganda, Kenya, Zimbabwe, Lesotho, Pakistan, and the Pacific. More recently she has been providing health strategy, policy, and technical advice to the Australian Department of Foreign Affairs and Trade (DFAT).

Patrick Ransom is an environmental engineer and certified cost estimator with more than 30 years of experience evaluating environmental technologies, policies, and regulatory costs. 

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

Robin Koralek is a seasoned evaluator and project director with over 30 years of experience in evaluating federal and state social welfare programs. Her expertise spans areas such as food assistance, employment and training cash assistance, and barriers to employment, including for those recovering from substance use disorders. She has worked with various governmental and non-profit organizations, focusing on program design, implementation, and outcomes.

Geoff Scahill has over 20 years of experience working in and managing international development programs. He has worked extensively within Papua New Guinea (PNG) and the Pacific – predominantly in Indonesia, Fiji, Samoa, and the Solomon Islands. He brings a long history as a health sector professional and has held roles as a health management advisor and health systems adviser in Pacific Island Countries. Geoff draws on his background in finance and economics to work with counterparts to increase efficiencies within the programs Abt Global delivers.

James Gilling, regional vice president, East Asia and Pacific, has almost 40 years of experience in social and economic development in low- and middle-income countries. He has overseen Australian aid programs worth hundreds of millions of dollars and managed large teams of Australian and overseas staff, including as head of the Australian aid program in Indonesia. James has worked for United Kingdom (UK) and Papua New Guinea governments as an agricultural economist. He has also worked as a consultant economist with Oxford Policy Management in the UK and was an economic analyst with the Office of National Assessments in Australia.