Rosario (Charo) was trained a medical doctor (MBBS) at the University of Seville, Spain. She went onto complete her Master of Clinical Tropical Medicine at Mahidol University in Bangkok, Thailand. She has extensive experience in epidemiology, public health, and health information systems and has worked for over 15 years in international development and humanitarian settings, engaging in research, programme monitoring, and capacity building. In her most recent role for Médecins Sans Frontières Spain, she led the organization's DHIS2 system, and provided expert advice and technical support to the implementation of a large-scale monitoring system to improve health outcomes. Before her work at Médecins Sans Frontières, she worked as Research Fellow for TREAT Asia and for the National Centre for Infectious Diseases in Singapore, where she conducted HIV epidemiological studies and researched the evolution and transmission of Streptococcus pneumoniae through GWAS analysis.