Ó Súilleabháin left a rich legacy through his own music, as well as the Academy he founded which attracted students from over 50 countries who enrolled on undergraduate and postgraduate courses in Music Therapy, Contemporary Dance Performance, Irish Traditional Dance Performance, Community Music, Festive Arts, Irish Traditional Music Performance, Classical String Performance, Ethnomusicology and others.He was hugely instrumental in the relocation of the Irish Chamber Orchestra from Dublin to its current home at the University of Limerick. Awards included Honorary Doctorates of Music from University College Cork, (2005) and The Royal conservatoire of Scotland (2017), Ollamh na hÉigse (Inaugural award by Comhaltas Ceoltóirí Éireann in 2006); Honorary Alumnus Award (Boston College) and the O’Donnell Chair of Irish Studies from the University of Notre Dame (2012). He studied at University College Cork (B.Mus.1972, MA 1973) with the composers Aloys Fleischmann and Seán Ó Riada, and in Queens University Belfast (PhD 1987) with the ethnomusicologists John Blacking and John Baily.
He produced a series of CD recordings in America, the UK, and Ireland on the traditional music of the Shetland Islands, Donegal, Cape Breton Island and on Irish traditional musicians in the USA and in England.
He is survived by his wife Professor Helen Phelan and their son Luke; sons Eoin and Mícheál (Moley), and their mother Dr Nóirín Ní Riain, and by his brother John.