Dr. Tewodaj (Todi) Mengistu is a Senior Programme Officer in the Measurement and Strategic Information team at Gavi, the Vaccine Alliance. In her role, she leads data and analysis for strategic decision-making and reporting, with a focus on robust estimates of the health and economic impact of Gavi-supported vaccines. Prior to Gavi, she worked at the U.S. Centers for Disease Control and Prevention (CDC) as a health economist with the Division of Global HIV/AIDS evaluating the effectiveness of delivery services for HIV prevention, care, and treatment in countries with high HIV burden.
Salin Sriudomporn is a Research Associate II/Health Economist in the International Vaccine Access Center (IVAC) at the Johns Hopkins Bloomberg School of Public Health. She has primarily worked on economic impact modeling for the Gavi investment case and WHO’s Immunization Agenda 2030, and has contributed to projects including HIV/AIDS index testing in India, measles school-based campaign delivery in Zambia, and digital health initiatives in Brazil, Ghana, Rwanda, and India. Her current work focuses on costing, financing, funding gaps, and return on investment for immunization programs through the Decade of Vaccine Economics (DoVE) project and Vaccine Economics Research for Sustainability and Equity (VERSE), including the development of the R-Shiny tool for immunization program analysis.
Dr. Allison Portnoy is an assistant professor of global health focused on vaccine decision science and policy. Her research includes economic evaluation and public health policy, simulation modeling, health equity, and the impact of vaccination on population health and economic outcomes. She is particularly interested in broadening the value of vaccination in high-burden settings. Her ongoing work spans multiple diseases areas, including human papillomavirus (HPV), measles, and tuberculosis (TB). Dr. Portnoy received a Doctor of Science from the Department of Global Health and Population and completed a postdoctoral fellowship at the Center for Health Decision Science, both at the Harvard T.H. Chan School of Public Health. Her previous education includes an MSPH in Health Policy & Management from the Johns Hopkins Bloomberg School of Public Health and a BA in International Relations from Stanford University. She previously worked as a health economist at the International Vaccine Access Center at Johns Hopkins, and conducted research projects with the World Health Organization, Agency for Healthcare Research and Quality, and the University of Washington in Seattle.
Kaja Abbas is an Associate Professor at the London School of Hygiene & Tropical Medicine and Nagasaki University. His research area is vaccine impact modelling with a focus on estimating the health, economic, and equity impact of vaccination programs to support evidence-based decision-making on vaccination strategies.
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