Current Fellows

2025-2026 Fellows

Sarah Aly, DO
Affiliated US Institution: Yale University
Sarah Aly is a Global and International Emergency Medicine fellow at Yale University. She has a BA in Middle Eastern Studies from NYU and attended medical school at Touro College of Osteopathic Medicine where she was president of the International Medicine club. Previous projects include adapting palliative care in Puerto Rico and implementing a new emergency triage system in Armenia.
Edson J. Ascenio Yunaccallo, MD
Affiliated US Institution: Yale University
Dr. Ascencio is a Peruvian physician and global health researcher focused on climate-sensitive diseases. As a GHES Fellow, he investigates how temperature induced mobility influences dengue transmission in the Peruvian Amazon, integrating seroepidemiology, hydrology, and remote sensing (such as drones) to inform local and global vector-borne disease control.
Etwal Bou Raad, PhD, MPH, PharmD
Affiliated US Institution: Yale University
Dr. Etwal Bou Raad recently attained her PhD in Epidemiology and has over 15 years of experience in teaching and advising pharmacy students. Throughout her career, Dr. Bou Raad promoted the role of the pharmacist in patient care and safety by integrating patient-centered care competencies within the pharmacy curriculum.
Jack Carew, MPH
Affiliated US Institution: Yale University
Jack Carew is a PhD student in the Department of Epidemiology of Microbial Diseases. He has collaborated with teams in Syria, Colombia, Jordan, and Cameroon on projects elucidating environmental and genetic characteristics of malaria and leishmaniasis transmission. His GHES project investigates the use of xenosurveillance for monitoring the and spread of partially artemisinin-resistant malaria.
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Edith Chepkorir Limbaso, PhD, MS
Affiliated US Institution: Yale University
Dr. Edith Limbaso has an extensive track record in medical virology, vector-borne diseases, viral hemorrhagic fever viruses, and zoonotic disease transmission. She has over 22 publications and delivered numerous National and International conference presentations. She has garnered several prestigious awards, including the L’Oréal-UNESCO for Women in Science Sub-Saharan Africa 2015 Award.
Dieudonné Diloma Soma, PhD, MS
Affiliated US Institution: Yale University
Dr. Soma’s research will focus on the development and validation of targeted sequencing combined with dual-index barcoding and Illumina sequencing to profile the resistance, speciation and phylogeny of the main vectors and other secondary vectors for the use of new-generation long-lasting insecticidal nets.
Muluken Gizaw, PhD, MPH
Affiliated US Institution: University of Arizona
Dr. Muluken Gizaw is a cancer epidemiologist and assistant professor of Public Health. He serves as a senior researcher in the Non-Communicable Diseases working group, focusing on cancer prevention and has authored over 50 peer-reviewed publications. His interests include cancers of the female reproductive organs, digital health, HPV-based screening implementation, and post-screening care pathways.
Prince Jacob, PhD, MSc
Affiliated US Institution: Yale University
Dr. Prince Jacob, PhD is an Assistant Professor with specialized expertise in the genomic profiling of monogenic diseases, leveraging next-generation sequencing technologies. His research is dedicated to uncovering mutation profiles, novel disease-gene associations, and the molecular mechanisms of rare genetic disorders.
Anju Kane, MPH, MA
Affiliated US Institution: University of Arizona
Anju Franklin Kane is a doctoral student in Population and Public Health Sciences at the USC Keck School of Medicine. During her fellowship year, she will explore psychosocial and structural barriers in HPV screening and completion of the cascade among women aged 30–65. Her past research focused on maternal and infant mortality and cervical cancer prevention. Her recent research has been in Kenya, Malawi, and Cuba.
Cyrianne Keutcha, PhD
Affiliated US Institution: Yale University
Originally from Cameroon, Cyrianne was awarded an NIH Fellowship at Johns Hopkins University to study the metabolism of the malaria parasite. She pursued a Ph.D. in Biological Sciences in Public Health at Harvard, focusing on understanding malaria invasion. She is a postdoctoral fellow at YSPH investigating the impact of genetic variations in the malaria vaccine candidate PfRH5 on the host immune evasion.
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Ruchira Khosavanna, MD
Affiliated US Institution: University of Washington
Ruchira (Ruth) is an Infectious Disease fellow at Yale School of Medicine. Originally from Thailand, she moved to the US and earned her medical degree from Oregon Health & Science University. She completed an Internal Medicine Residency from the University of Florida. Her project is on dengue and Zika surveillance. She enjoys traveling, exploring cuisines, and learning languages.
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Christopher LeBoa, MS, PhD
Affiliated US Institution: University of California, Berkeley
Christopher LeBoa is a postdoctoral scholar with the University of California, Berkeley, and the Universidad of San Francisco de Quito. His work focuses on identifying exposures to infectious diseases in food systems. He will conduct a mixed-methods study to investigate antimicrobial-resistant bacteria in irrigation water across Ecuadorian watersheds to understand the role biosecurity practices play in hygienic food systems.
Jeadran Malagon-Rojas, PhD, MD, MA
Affiliated US Institution: Yale University
Dr. Jeadran Malagón-Rojas is a Colombian physician and epidemiologist with over a decade of experience in public health research and program implementation. His research focuses on epidemiology and occupational health. Dr. Malagón-Rojas has collaborated with governmental and academic institutions to drive public health policies. His project will investigate the effects of wildfire-related air pollution.
Abdelrahman Mohamed, MBBCh, MSc, MS
Affiliated US Institution: Yale University
Abdelrahman Mohamed, MBBCh, MSc, is a physician specializing in Occupational and Environmental Medicine. He holds a Master’s in Epidemiology, with a concentration in Occupational and Environmental Health. Currently, he is a Postdoctoral Associate at AUB and Yale. His project will assess silica exposure, safety practices and respiratory symptoms among workers in the stone countertops industry.
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Immaculate Mutisya, MSc, MD
Affiliated US Institution: Stanford University
Dr. Mutisya is a Global Health Specialist and Pediatrician with advanced degrees in Global Health, Pediatrics, and Medicine. She has extensive experience leading HIV, TB, and MNCH programs, policy development, and innovations. She is the founder of Operation Triple Zero, now scaled across over 10 countries. Dr. Mutisya is a recipient of the Global Adolescent Health Award and a Global TB Elimination Champion.
Stanely Ndwiga, MPH, MBChB
Affiliated US Institution: Yale University
Dr. Stanley Ndwiga is a physician-researcher with over a decade of experience in HIV research. He earned his MPH in 2024 and has led and coordinated multiple clinical trials at the Kenya Medical Research Institute and Gertrude’s Children’s Hospital, focusing on improving outcomes for adolescents and young adults living with HIV. His research interests center on treatment adherence and youth-friendly services and policy.
Cherinet Osebo, PhD, MSc
Affiliated US Institution: Stanford University
Originally from Ethiopia, Dr. Cherinet Desta Osebo trained in integrated emergency surgery and served as an attending clinician, providing care to underserved communities. He later moved to the United States, earned a PhD in Global Surgery from McGill University in Canada, and is now a postdoctoral fellow at Stanford University, focusing on strengthening trauma and perioperative care systems through digital data infrastructure in resource-limited settings, under NIH support.
Jeffrey Pierre
Affiliated US Institution: University of Arizona
Mr. Jeffrey’s research explores how HIV-positive parents disclose their status to their children, with attention to differences in parental roles. Jeffrey is a doctoral candidate in psychology examining disciplinary practices across different communities. He also investigates protective factors that support healthy discipline. He collaborates with community stakeholders to develop support systems and resources.
Matthew Ponticiello
Affiliated US Institution: Yale University
Matthew Ponticiello (he/him) is an MD PhD student pursuing his PhD in Epidemiology of Microbial Diseases at YSPH in the Altice Lab. His research interests include HIV implementation science, opioid use disorder, and mood disorders. Matt is particularly interested in using qualitative methods to integrate social science and epidemiologic methods to improve the uptake of care.
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Hyelim Sim
Affiliated US Institution: Yale University
Hyelim’s research will focus on self-management of non-communicable diseases, including hypertension, diabetes, osteoporosis, and neurocognitive impairment, among people living with HIV. Hyelim is a third-year medical student at Penn State College of Medicine. She aims to build on her foundation of global health and patient-centered research to become a surgeon who can care for varied populations.