Katerina Rok Song, MD, MPH, is a research scientist at the International Vaccine Institute (IVI). She trained in Obstetrics and Gynecology and pursued subspecialty fellowship in Obstetrics. She began her career in vaccines at GlaxoSmithKline (GSK), initially working on HPV vaccines and later expanding her role to a broad vaccine portfolio as a Vaccine Medical Director at GSK Korea. She subsequently transitioned to the public sector, joining the Korea Disease Control and Prevention Agency (KDCA) prior to the COVID-19 pandemic, where she worked in the National Immunization Program (NIP) and Vaccine-Preventable Diseases (VPD) divisions as an Epidemic Intelligence Service (EIS) officer/VPD team manager during the COVID-19 pandemic. She has now been working at IVI for five years and has led multiple clinical trials as a project lead, including the Phase 3 Euvichol-S (oral cholera vaccine) study in Nepal and a Hecolin (hepatitis E vaccine) trial among pregnant populations in Pakistan.