Dr. Mari-Liis Kaldoja is an Associate Professor of Pediatric Neuropsychology at Tallinn University, Estonia, and a clinical child psychologist. Her research focuses on child neuropsychology, neurodevelopmental conditions, and digital and psychosocial interventions to support youth mental health and social-emotional development. She has extensive clinical and research experience working with children and adolescents with neurological, psychiatric, and developmental disorders. In the SELFIE study, she serves as Principal Investigator in Estonia and oversees the local implementation of the study, including support for recruitment, clinical assessments, and coordination with the local study team.