Duncan trained at the Conservatory of Music (DIT) and the Royal Academy of Music, London. At the Conservatory he studied organ with Peter Sweeney and voice with Colette McGahon. Progressing from here with a Bachelor of Music, he trained at the Academy with countertenor Michael Chance and Philip Doghan.
Transitioning from singing after his studies here, Duncan became assistant musical director of the West End Gospel Choir and artistic director of Soho Gospel, slowly establishing himself as a leading vocal coach and choir director on the London scene.
As a singer, Duncan has held contracts previously with the Chamber Choir Ireland, and the Grammy award-winning ensemble Ars Nova Copenhagen, and was also a gentleman of the choirs of St. Patrick’s Cathedral, Dublin and St. Mary’s Pro-Cathedral.
Duncan is the director of music for Diva Voces, a sixty-voice female four part choir. An award winning choir, they recently won ﬁrst place in two competitions at Limerick Choral Festival. Most recently, the choir collaborated with poet Paula Meehan and composer Georgia Johnston. The world premiere of ‘Prayer Before Starting & The Book of Changes’ took place in June 2018 to great acclaim.
Duncan is also director of music for the RDS Jazz Singers, The Brook Singers and 95-member strong choir, Dublin City Choral Union.
As a tutor, coach and accompanist, Duncan has worked extensively throughout the UK and Ireland. Whilst in London, he held permanent positions as a vocal coach for the ARK School Network and Stagecoach Theatre Schools. In 2017, Duncan became a member of staff of the music faculties of the American College, Dublin and DIT where he works as a tutor for BA and MA musical theatre students.
In 2016, Duncan was awarded a Fellowship of the Royal Society of Arts (FRSA) for his work in arts management as Curator for the Pride in London Festival for 2015 & 2016.