Holder of first prize in saxophone and chamber music at the Conservatoire National Supérieur de Musique de Paris, Gilles Tressos was appointed professor at the Conservatoire National de Région de Poitiers in 1990 after obtaining the Certificat d'Aptitude à l'Enseignement (C.A.) at the age of 20.
Since October 2006 he has been teaching Didactics at the Conservatoire National Supérieur de Musique de Paris in the Pedagogy - Teacher Training Department. As a pedagogical adviser at the CEFEDEM in Poitiers, the Ministry of Culture entrusted him with the programming and coordination of the preparation for the saxophone CA exam from May 2004 to January 2005 (CNR centre in Poitiers). He is regularly called upon as a jury member for the D.E., C.A., C.N.F.P.T. and C.N.S.M. exams in Paris. Since 2008, he has been a professor and coordinator at the Poitou Charentes Higher Education Centre (CESMD Poitou Charentes).
He has played with groups such as the Orchestre de l'Opéra de Paris, the Ensemble court-circuit, the Orchestre Poitou-Charentes, the Orchestre d'Île de France, the Orchestre National de France, the Orchestre National de Bordeaux Aquitaine. He is regularly invited by the Ars Nova Ensemble (project for the inauguration of the new theatre auditorium in Poitiers in October 2008).
Since 2004, Gilles TRESSOS has been a test and development consultant for the Henri SELMER Paris company. He contributed to the conception of the Baritone Saxophone Series III.
In 2000, he created Saxophone Événement with which he organizes the Habanera summer academy in Poitiers as well as professional training courses preparing for exams and artistic teacher competitions.
Within the Habanera Quartet, Gilles Tressos plays a baritone saxophone Selmer Series III.