Alexander Sloendregt was born in Adliswil in Zurich (Switzerland). Following twelve years of schooling he studied piano under Patrizio Mazzola at the Rudolf Steiner School. During his studies he was educated in wind music conducting under Franz Schaffner and Joseph Gnos at the Lucerne Conservatory, and in film music and orchestral composition under Hermann Schmidt and David Angel (Los Angeles).
For some years now Sloendregt is and has been active as a freelance piano and theory teacher, coach, arranger and composer. As well as various commissions for compositions and world premiers in Switzerland and abroad his extensive musical abilities also include commissions in the areas of theatre, arrangement and professional note setting. Until present his compositional work is comprised of works for the most varied of scores and styles. As a member of various ensembles he has toured in Germany, Russia, Rumania, Hungary and Mexico.
He has until now shown particular interest in reconstructing forgotten / missing works and composing for the amateur world (including for youth orchestras).