Aoife O’Sullivan studied piano with Frank Heneghan and later with John O’Conor. She graduated from TCD with an honours degree in music. In September 1999 she began her studies as a Fulbright scholar at the Curtis Institute of Music with Mikael Eliasen, head of vocal and opera studies, and in 2001 she joined the staff there for her final two years.
She was awarded the Geoffrey Parsons Trust Award for accompaniment of singers in 2005. She worked at the National Opera Studio in London from 2006 to 2008 and was on the deputy coach list for the Jette Parker Young Artist Programme at the Royal Opera House Covent Garden. She has played for masterclasses including those given by Malcolm Martineau, Ann Murray, Thomas Allen, Thomas Hampson, and Anna Moffo. She has appeared at the Wigmore Hall in Lieder recitals with Ann Murray, Wendy Dawn Thompson and Sinéad Campbell-Wallace. She has worked on the music staff at Wexford Festival Opera, Opera Theatre Company and Opera Ireland. She coaches the singers in the NI Opera Studio and the ABL Aviation Opera Studio. Since January 2010 she has been an assistant lecturer at the DIT Conservatory of Music and Drama working as a vocal coach and répétiteur.