Maestro Shannon has held leadership positions with Sarah Caldwell’s Opera Company of Boston (Artistic Administrator, Assistant Conductor, Conductor), Virginia Opera (Artistic Administrator, Associate Artistic Director, Conductor), Pensacola Opera (Music Director and Principal Conductor), Shreveport Opera (Music Director and Principal Conductor), Mobile Opera (General and Artistic Director, Principal Conductor) and the Janiec Opera Company of the Brevard Music Center (Resident Conductor and Vocal Coach).