A lover of the great symphonic repertory, Alexandre joined the Lille National Orchestra as solo horn at the age of 21, and has also played with the London Symphony Orchestra, the Philharmonia Orchestra, the Philharmonique de Radio France and Dissonances, as well as performing solo concertos. 　　He is regularly invited to prestigious international chamber music festivals (Juventus, Deauville, Prague, Ticino etc.), and has played there together with artists such as Alena Baeva, Alissa Margulis, Graf Mourja, David Petrlik, Julian Steckel, Marie Hallynck and Jonas Vitaud. His desire to explore the chamber music repertory led him to create the Ensemble Polygones together with his cellist wife, Natacha Colmez. This group mixes winds, strings and piano in a flexible, geometrically variable manner that allows them to interpret a great variety of works ranging from the very famous to lesser known treasures, contemporary pieces and spectacles for young audiences. The group has a particularly close collaboration with the composer Camille Pépin, and recently recorded a CD of her chamber music. 　　Devoted to the richness of brass instruments, Alexandre also belongs to the Lille Brass Quintet, and has taught at the summer academy for brass and percussion in Surgères since 2015.