Olivier Haas plays euphonium in the Royal Symphonic Band of the Belgian Guides, and teaches Euphonium at the Conservatoire Royal de Liège.

He finished his master degree in euphonium, trombone, and chamber music at the Conservatoire Royal de Liège, his conducting master at the Lemmens Institute, Leuven and his amster philosophy at the Université de Liège.

He was band assistant at the International School of Brussels and lowbrass teacher in several music schools of the area of ??Liège before joining the Symphonic Bands of the Belgian Defense in 2001, as solo euphonium with theRoyal Belgian Navy Band. In October 2005, he joined the Royal Symphonic Band of the Belgian Guides.

Since 2002, he teaches euphonium and tuba in the low brass department of the Conservatoire Royal de Liège (CrLg). He has been for several years guest euphonium teacher at the Conservatoire à Rayonnement Régional de Lille(France). He conducts the CrLg Wind Band. In addition to those activities, he plays regularly with leading symphonic orchestras, ensembles, wind and brass bands.

Olivier won prizes from several competitions (including the prestigious Tenuto competition in Belgium). He is particularly busy with bandconducting, master classes and as a jury member in Belgium and abroad (France, Germany, the Netherlands, United States, Italy).