Theodosia Ntokou was born in the island of Rhodes to a family of music lovers. She began to study piano at the age of twelve to a small section of the conservatory in Rhodes. Starting at sixteen Theodosia studied for five years at the National Conservatory with Aris Garufalis, and graduated with honors, and as she has quoted many times he was "The professor who built her character, and told her never to give up".
Theodosia then continued her studies with Hungarian pianist Laszlo Simon at the Universität der Künste in Berlin and simultaneously received her Postgraduate Degree from the Franz Liszt Academy of Budapest. Theodosia moved to America, where she completed her Master's Degree with Russian pianist Oxana Yablonskaya and went on to earn her assistantship at the prestigious University of Hartford-The Hartt School in Connecticut.
Theodosia Ntokou has also performed in many festivals across Europe such as the prestigious Progetto Martha Argerich, the Ravello Festival, the Athens & Epidaurus Festival, the Martha Argerich Festival, the Crans-Montana "Les Sommets du Classique", the Armonie d'Arte Festival, the Busko Zdrój Festival in Poland, the Rolandseck Festival in Germany, the Sagra Musicale Malatestiana, the Festival Pianistico Brescia e Bergamo and the Carloforte Music Festival in Italy and has collaborated with many orchestras such as the Royal Philharmonic Orchestra, the Amsterdam Sinfonietta, the Berliner Symphoniker, the Athens State Orchestra and the Berliner Camerata, the Youth Orchestra of Bahia among others.
Theodosia has been performing extensively in many prestigious halls through Asia, Europe and the United States.
An important step in her life was her meeting in 2009 with the legendary pianist Martha Argerich, who after an audition, became her mentor, inspiration and has led her to new paths in her career. Since then, Theodosia has been under her guidance.