William Riley Leitch is a Chicago area trombonist. Riley has performed at the Nief Norf Festival, soundSCAPE Festival, and the Lucerne Festival Academy where he studied with members of Ensemble Intercontemporain and Ensemble Modern. Riley has premiered over 30 new works for solo trombone, chamber ensemble, and orchestra at events and venues such as Ear Taxi Festival and Red Note New Music Festival. He is currently commissioning new works for trombone that cross traditional disciplinary boundaries.