Zisis Papathanassiou studied Medicine at the University of Athens and specialized in Obstetrics and Gynecology.
He was trained in France as a fellow of the French government in the field of Andrology and Sexology at the University of Lyon. He later served as a UNESCO Fellow in Birth Control and Contraception.
He was elected Lecturer and Permanent Assistant Professor of Obstetrics and Gynecology at the University of Thessaloniki. In 1996 he founded with his associates the “Hellenic Institute of Sexology”, which he still manages.
With forty years of clinical and scientific experience in the field of Sexology, he has written eight more books for the general public, aiming to contribute to informing people about sexuality and companionship.
He was particularly interested in and continues to be involved in the sexual education of young people. He wrote in 2000 with K. Gotzamanis, psychiatrist and the corresponding books on behalf of the Ministry of Education (student book, teacher book).