De Ley studied flute and piano at the High school for music and at the Royal Music Conservatory in Antwerp,Belgium.
 Later he studied composition with the Belgian composer Alain Craens and he received many very valuable guidelines from the Ukrainian composer Alexander Shchetynsky.
De Ley is currently the artistic administrator for Brussels Philharmonic and the Flemish Radio Choir
 
The music he writes is classical in the sense that it isn’t pop,on the other hand it’s modern in the sense that it isn’t classical because it isn’t all together tonal.

Currently he works as artistic administrator at the Flemish Radio Choir.