After finishing his studies clarinet with Walter Boeykens and piano with Robert Groslot at the Conservatory in Antwerp, Jaan Bossier founded the Mahler Chamber Orchestra. Since 1993, Bossier has been clarinetist for ChampdAction, where he made his conducting debut in December 2000. Since 2003, he has been playing the clarinet and the bass clarinet in the Lucerne Festival Orchestra.
Bossier has participated in conducting masterclasses with Jorma Panula and has taken private lessons from Pierre Boulez and Zsolt Nagy. He is the co-founder and conductor of Ensemble 306, a contemporary music ensemble based in Eindhoven. With soloists from the Mahler Chamber Orchestra and the WDR Symphony Orchestra in Cologne (DE), Bossier plays chamber music concerts in different European countries and in Japan. He also founded the Particella, a chamber music ensemble, in which he plays the clarinet. Since 2009, he has been working as an assistant to Professor Marco Thomas.