Country coordinator for the CARE project and currently for ISOTIS Project. His main areas of research interests concern effects of early child care and education experiences (parent-child relationships; attachment behaviour; working mothers role and relationship with young children) and impact upon children's development, children’s behaviour problems and children’s resilience, adolescent transition difficulties (family-school relationships, coping and resiliency), computer use and preschool children’s socio-emotional development, Roma parents' ethnotheories and their children's development and relations to school. He has participated in a number of international research projects. He has also been involved as an external evaluator in Comenius projects regarding a cross-cultural educational training program for primary school teachers. He was team leader in two large scale projects regarding Roma children schooling inclusion and learning. Petrogiannis collaborated extensively with Prof. E.C. Melhuish (University of London and Oxford) in review studies of ECEC.