Professor Maiello conducts the GMU Repertory Orchestra and teaches Graduate and Undergraduate Conducting, Jazz Theory & Arranging and Advanced Sight-Singing.  From 1996 to 2009, he conducted the GMU Symphony Orchestra and Chamber Orchestra. Under his direction, the ensembles at both Crane and George Mason University commissioned new works, made numerous recordings and appeared at national and international conferences. Professor Maiello also makes professional appearances both nationally and abroad conducting music festivals, adjudicating ensembles and presenting clinics, lectures and workshops throughout the United States, Canada, Mexico, the Bahamas and Europe.