After attending the Marciac College and then the Bordeaux Conservatoire in the clarinet and bass clarinet classes of Richard Rimbert and Stéphane Kwiateck, Jean Dousteyssier devoted himself essentially to the practice of jazz and improvised music by joining the National Superior Conservatory of Music in Paris.
He is one of the founding members of the Paris Swing Collective, the Watt clarinet quartet or the Post K quartet which received numerous awards and was a member of the Jazz Migration tour.
In 2013 he became solo clarinetist of the Orchestre National de Jazz for the entirety of Olivier Benoit's mandate. In parallel, he participates in numerous contemporary and improvised music ensembles such as ONCEIM, Pan-g or as a substitute in the Ensemble Hodos.
Jean Dousteyssier participates in 2019, both as a harpsichordist and clarinettist, in the creation of a show around the Roman de Renart, directed by Fidel Fourneyron and as a composer, he writes the music for two shows by Karim Messaoudi, Le K and Portrait Chinois.
Regularly called as a soloist or in various orchestras around the world, or for the radio (À l'improviste, Alla Breve, Open Jazz…). ) He performs with the Umlaut big band, the Laurent Mignard Duke Orchestra, the Syncopation Orchestra, the Musiques à Ouïr company or with musicians such as Louis Sclavis, Sylvain Rifflet, Théo and Valentin Ceccaldi, Antonin Tri Hoang, Kahil el Zabar, Giacommo Smith, Fidel Fourneyron, Edouard Pennes, Romain Vuillemin, Matthieu Naulleau, Benjamin Dousteyssier, Pierre Antoine Badaroux.
He is also a harpsichordist and organist and performs regularly with the violist Clémence Shiltz and the violinists Clara Dachin and Katia Darisio. As an organist, he participated in the creation of the show Orgabak with Christophe Macé, Jean Luc Guionnet and Lotus Eddé Khoury. He organizes with the latter two the Entrelac Festival since 2021 in Finistère and also programs with Pierre Antoine Badaroux, Benjamin Dousetyssier and Louis Laurain the Jazz Series evenings in the 18th district of Paris.