Jan Hadermann was born near Antwerp (Belgium) in 1952. He received his first music lessons from his own father. Once he chose to undertake professional training he went to Louvain where he studied at the Lemmens Institute.
There he received the Certificate for Composition & Musical Education, together with First Prizes for Theory of Music, Harmony, Counterpoint and Fugue.
He also studied at the Royal Antwerp Conservatory of Music where, as a student of Willem Kersters, he received the First Prize for Composition.
Since 1973 Jan Hadermann has taught counterpoint, fugue and composition at the Lemmens Institute in Louvain, and from 1979 to 2002 he taught composition at the Royal School for Carillon "Jef Denijn" in Mechelen. He also teaches the theory of concert-band conducting at the Royal Antwerp Conservatory of Music. Besides teaching and composing, Jan Hadermann is a conductor, clinician and member of several juries.
Jan Hadermann not only writes for concert bands, but also for piano, symphonic orchestra, choir, chamber orchestras and electronic music. Most of his works have been played by the best ensembles in Belgium and abroad, and have been recorded on CD.
In 1993 Jan Hadermann received the Sabam Award for wind band music, which is presented every four years.