Geert Callaert took piano classes with Jan Vermeulen in Leuven. In 2002 he graduated at the Orpheus institute with a project on the piano music and chamber music with percussion of Karlheinz Stockhausen, Iannis Xenakis and Charles Wuorinen. During his formative years he participated in many seminars, among them the Stochhausen courses for the interpretation of his music and computer seminars at the IRCAM in Paris. He is much sought after as a soloist and a chamber musician at home and abroad because of his large repertoire, ranging across the whole gamut from classical to new music. He collaborated with the Prometheus Ensemble, the Flanders Opera, the Philharmonic Orchestra, I Fiamminghi, and the Flemish Radio Orchestra. Callaert is also a composer and a teacher of piano music and chamber music for students who want to specialize in contemporary work. He is co-founder of the Belgian Chamber Philharmonic, which aims at providing opportunities for young composers to develop their skills for orchestral work, while being tutored by a composer of renown. Geert Callaert is a member of the artistic board of the HERMESensemble.