Theoni Mastrantoni was born in Athens, where she lives and works. She studied Business Administration, and one of her postgraduate degrees focuses on the management of cultural institutions—a choice that was not coincidental, but a natural continuation of her deeper interest in art, culture, and their role in the modern world. For her, painting became a way to connect her inner world with artistic expression. She has participated in group visual art exhibitions, while simultaneously exploring how culture bridges places, experiences, and sensations. Over her long engagement with painting, she has attended classes at art workshops, particularly with visual artist Rania Kapeliari, and has completed an educational program at the National and Kapodistrian University of Athens (EKPA) on painting materials and composition techniques.