Vagelis Iliopoulos was born in Athens in 1964. He studied Pedagogy and Theology at the National and Kapodistrian University of Athens. Since 1984 he has been working in primary private education. In 2013, he was designated a mental health messenger by the Association for the Psychosocial Health of Children and Adolescents.
In 1995, his first children's book The Adventure of the Creased Sock (Οι Περιπέτειες μιας Ζαρωμένης Κάλτσας) was published. A prolific writer to this day, he has authored many successful books for children and teenagers with The Little Triangle-fish (Ο Τριγωνοψαρούλης, 1997), The Suitcase and the Three Teapots (Η Βαλίτσα με τις Τρεις Τσαγιέρες, 2001), The Little Disgusting Brown Ball (Καφέ Αηδιαστικό Μπαλάκι, 2003), Ready Since a Long-time Past (Έτοιμος από Καιρό, 2005), Play it Backwards (Παίξε το Ανάποδα, 2008), Migrating Stories (Κι οι Ιστορίες Μεταναστεύουν, 2009), Does the Real Triceratops Get Scared? (Ο Αληθινός Τρικέρατωψ Φοβάται; 2015), Raising My Grandmother (Μεγαλώνοντας τη Γιαγιά Μου, 2016), Thomas Q.bit: Traveller in the Mirror of Time (Θωμάς Q.bit: Ταξιδιώτης στο Κάτοπτρο του Χρόνου, 2017) and The Boat Called Memory (Η Βάρκα που τη Λένε Μνήμη, 2017). His adventures have been translated and published in Bulgaria, Ireland, Germany, Italy, Spain, Serbia, Malaysia, Turkey, Korea and China.
Iliopoulos has been nominated for the Astrid Lindgren Award by the Cyprus Department of IBBY and for the H. C. Andersen Award by the Hellenic Department of IBBY - Greek Children's Book Circle, which named him Ambassador of the Greek Children's Book for 2018.