I am Professor of Developmental and Educational Psychology in the Department of Pedagogy and Primary Education, School of Education, at the National and Kapodistrian University of Athens (NKUA), Greece. I am a qualified school psychologist (MSc) and a certified cognitive-behavioral therapist, and I have also received training in psychoanalytic psychotherapy. I completed my PhD in the Department of Psychology at NKUA, supported by a scholarship from the Greek State Scholarships Foundation. I currently serve as Director of the Psychology Laboratory in the Department of Pedagogy and Primary Education. I have served as Coordinator of the Developmental Psychology Section of the Hellenic Psychological Society (HPS) and as Associate Editor of Psychology, the journal of the HPS. I am also a member of the editorial boards of several Greek and international academic journals. My theoretical and research interests focus on social and emotional development in childhood and adolescence, including loneliness, solitude, and egocentrism; emerging adulthood and the transition to adulthood; school adjustment, including classroom dynamics and student–teacher relationships; behavioral problems and psychopathology, including bullying, victimization, and social withdrawal; and psychoanalytic perspectives on development and education. I am the author of four books, seven self-help guides, and more than 100 empirical and theoretical studies published in Greek and international journals and edited volumes.