Eleni Elefterias is an academic and teacher of Modern Greek who enjoys writing songs, lyrics and stories for children in Greek. She is the creator and writer of the HELLENIC THEOREM concept for which she is creating a bilingual series of fun educational books for children.

Oliver Milgate is a Multimedia Producer based in Sydney, Australia. He is the Founder of NXT Creative, a commercial content studio and LUCIA Visual, a boutique event photography service. He has designed the layouts for several books in the Hellenic Theorem series including "My Grandma is a Musician (Η γιαγιά μου είναι μουσικός)", "When Will You Play With Me? (Πότε θα παίξουμε μαζί)" and "I Want to Learn Greek (Θέλω να μάθω ελληνικά).