Hannah Tong is a Research Associate in the Department of International Health. She has a Bachelor’s degree in Nutritional Science from University of California, Berkeley and a Master’s degree in Human Nutrition from the Johns Hopkins School of Public Health. In her current role, she conducts literature reviews to update the evidence base for LiST and improves methods for nutrition modeling.

Helen Kuo is a Research Associate in the Department of International Health. She has a Bachelor’s degree in Biology from Mount Holyoke College and a Master in Public Health from Boston University School of Public Health. She has extensive experience with vaccine research and clinical trials studies. In her role as LiST data manager, she is designing and implementing a new LiST REDCap database to improve ongoing data collection and analysis.

Neff Walker is currently a Senior Scientist in the Department of International Health. Before coming to Johns Hopkins University he spent four years at UNICEF as the Senior Advisor for estimation and modeling related to the impact of HIV/AIDS as well as serving as UNICEF's focal point for the Child Health Epidemiology Reference Group (CHERG). From 1998 through 2003, Neff worked as the Senior Advisor for statistics and modeling at United Nations Program on HIV/AIDS. In both positions a primary focus of his work was the development and implementation of standard methods for estimation and modeling related to disease burden. Prior to working at the United Nations, Neff spent 15 years working as a faculty member in the areas of computer science and human factors.  He also served as Co-Associate Director for Internal Relations and Assistant Professor at the Georgia Institute of Technology School of Psychology.  He earned his Ph.D. in Cognitive Psychology from Columbia University and has been an assistant professor at the American University of Beirut and a visiting assistant professor at the University of Michigan. He also has had research interests in movement control, computer-based tutorial systems to promote the acquisition of basic skills, and interpreting graphical representations.  Dr. Walker is also an editor for DCP3's Reproductive, Maternal, Newborn and Child Health publication.

Tim Roberton is an Assistant Scientist in the Department of International Health. As part of the LiST team, he focuses on innovation including software development while playing a key role in other IIP projects such as the National Evaluation Platform (NEP) and RADAR. His dissertation research examined the role of community health workers in Burkina Faso and before coming to Johns Hopkins, Tim worked in the Palestinian Territories and the North Caucasus. He has also worked in Banda Aceh, Malawi and Georgia. He has held positions with World Vision and the Australian Red Cross, with responsibility for a range of health projects including mobile medical teams for displaced families, child friendly spaces, rehabilitation of health clinics, and the restoration of blood transfusion services.

Yvonne Tam is a Senior Research Associate in the Department of International Health of Johns Hopkins Bloomberg School of Public Health (JHSPH). In her current role, she contributes to the vaccine modeling methods and assumptions in the Lives Saved Tool. She provides training and technical support to colleagues at bilaterals and NGOs on how to use the tool for program planning, evaluation, and advocacy. She also co-coordinates the master program of the Global Disease Epidemiology and Control division in the Department of International Health at JHSPH. Before joining the LiST team, Yvonne worked at WHO to track maternal health policy indicators for the Countdown to 2015 project, and at UNICEF India to evaluate their school-based water and sanitation program. Yvonne received her Master in Health Science from JHSPH.