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Michael Witt brings more than 33 years of experience as a statistician specializing in survey design and survey data analytics. He has more than 27 years of managing staff at the administrative and project level. Mr. Witt has worked with government clients in fields ranging from energy to healthcare.

Dr. James White, a registered nurse and Collaborative Specialist in Global Health (CSGH), is a senior health specialist with a focus on infectious disease and global health security (GHS). He has over 20 years of experience that includes delivery of emergency response programs in emergency and fragile settings, pandemic preparedness and response, health systems strengthening, and public-private collaboration for GHS. White has worked in more than 20 countries in Africa, Asia, and Latin America assisting in both acute outbreak response and preparation for health emergencies. He also represents Abt as a technical expert on external GHS and pandemic preparedness working groups. His clients have included the U.S. Agency for International Development (USAID), the United Kingdom’s Foreign Commonwealth and Development Office (FCDO), and the Canadian International Development Association (CIDA) (now Global Affairs Canada).

René Nutter is the U.S. Food Security & Agriculture Client Account Lead. She has more than two decades of experience helping further food security and education in women and children. From studies with Yale, Harvard, and the Gates Foundation to a long and successful partnership with the USDA Food and Nutrition Services (FNS), she has led large data collection studies and evaluations, provided technical assistance, and helped train the next generation of researchers.

Dr. Fiona Mactaggart is a multi-disciplinary technical advisor with more than 10 years of experience in monitoring, evaluation, research, and learning (MERL); infectious disease control; and public health. As a co-lead of Abt's MERL portfolio, she draws on complexity theory and scientific methods to help clients test what works, discover why it works, and provide timely evidence-based recommendations to inform important decisions about policy and practice. Mactaggart contributes to business development, programme delivery, and thought leadership. She works in five key areas: monitoring (e.g., design of digital tools and visualisation platforms) research (e.g., cross-sectional survey design), evaluation methodologies (e.g., contribution analysis), learning (e.g., portfolio level evidence-informed strategic decision making), and cross-cutting MERL capabilities (e.g., adaptive management and GEDSI). Mactaggart has worked extensively in the Pacific and Southeast Asia.

Dr. Hecht is an environmental economist with more than 19 years of experience in economic analysis, policy analysis, and research. His primary areas of expertise are in environmental economics, cost-benefit analysis, regulatory economics, and decision analysis. Dr. Hecht is an expert in estimating the monetary value of “non-market” benefits, such as improvements in environmental quality, public health, safety, and security. Dr. Hecht has over 10 years of experience in the economic analysis of climate change and in evaluating the costs and benefits of climate change mitigation measures.

Mbuso Jama has more than 17 years of experience as a Monitoring Evaluation Accountability Research and Learning expert (MEAL and MERL). His work has involved humanitarian, rehabilitation, and development efforts in Africa, Asia, and Eastern Partnership countries. His experience ranges from designing MEAL systems for adaptive management to impact evaluations. He has worked on projects funded by the Foreign, Commonwealth & Development Office (FCDO), United Nations, US Agency for International Development (USAID), Canadian International Development Agency, Department of Foreign Affairs and Trade, European Union, and European Civil Protection and Humanitarian Aid Operations.

Caroline G. Staub, Ph.D., is an analytical and strategic international development professional with 10-plus years leading programs in climate change adaptation and resilience, environmental science, natural resources management, sustainable agriculture, and food security. Her work tends to address finite, fragile, and/or remote geographical settings. She has extensive experience leading cross-functional, multi-cultural teams, trainees, and public/private partnerships in support of projects that incorporate critical thinking and capacity building to inform course corrections and ensure accountability and sustainability.

Rosa Amboage is an environmental economist with 10 years of experience expanding markets for nature-based solutions (NbS) to achieve climate, economic and social progress. Working across academic, private, and public sectors, her expertise includes land use policy, NbS, environmental markets, green finance, and natural resource management.Amboage contributed to the UK’s post-Brexit agri-environmental policies and designed its first national scheme promoting a natural capital approach to economic and climate goals. Before Abt, she was the lead economist of the £640M GBP ($740M USD) Nature for Climate Fund, a national program to help industries and communities realize net-zero ambitions.

Jennifer Cissé leads Abt’s Climate Adaptation and Resilience practice, including strategy development, business development, project execution, and thought leadership across its public and private sector client portfolio, both in the U.S. and internationally. She uses her more than 15 years of experience as a risk and resilience expert to serve as the climate adaptation technical lead for public and private sector clients.

Ellen Bomasang is a global development professional whose focus has been clean energy, climate, and inclusive growth across emerging economies in Asia, Africa, Eastern Europe, Latin America, and the Middle East. Bomasang’s more than 25 years of experience have earned her recognition as a thought leader in clean energy and gender equality and social inclusion (GESI). She has led GESI-related interventions around the themes of women’s and girls’ leadership, male allyship, women’s economic empowerment, GBV prevention and response in energy/infrastructure projects, and building diverse, respectful workplaces.