William Kleinsasser's compositions range from acoustic chamber and orchestral pieces to interactive computer music. His work integrating electro-acoustic music with virtuosic instrumental performance has been widely recognized and supported by commissions and grants from the National Endowment for the Arts, the Maryland State Arts Council, the American Music Center, Meet the Composer, and the Argosy Foundation among others. Kleinsasser's compositions have received national and international recognition in concerts, competitions, conferences and festivals.
His music has been presented in public readings by the Indianapolis Symphony and the Civic Orchestra of Chicago, and a select list of presentations and performances include the ISCM-World Music Days, the National Symphony Orchestra, the League of Composers/ISCM, the Pittsburgh New Music Ensemble, the Philadelphia Orchestra Trombone Quartet, the American Camerata for New Music, duo runedako, the Washington DC Composers Forum, and the New Music Ensemble at Towson University. Kleinsasser's music is Recorded on the Mark, C74, Innova, and Ars Harmonica (ICMA) labels.
Kleinsasser holds Master of Music and Doctor of Music degrees in composition from Indiana University School of Music and Bachelor of Arts and Bachelor of Music degrees from the University of Oregon. In addition to his role as professor at Towson, he is the Director of the New Music Ensemble.