McGlynn has written music for theatre, including the Adrian Noble/Cusack family production of Anton Chekhov's "Three Sisters" at the Gate Theatre, Dublin, and the Royal Court, London. He is also a vocal and choral clinician, working recently in the University of Miami (US), Sumida Hall (Japan) and Festival 500 in Newfoundland (Canada). He was an Eminent Scholar at Florida Atlantic University for the 2011–12 academic year. McGlynn will be the Artistic Director of the 2021 Tampere Vocal Music Festival in Finland.