Brought up in Carrick, Co. Donegal, Oisín grew up surrounded by fiddle music. He learned from Ben Lennon among others before pursuing a music degree at Queen's University, Belfast. He became a touring musician, playing with Stockton's Wing, Cran, Alan Kelly, Hot Club of Dublin and others before joining Danú in 2001.
Oisín is at home with many styles of fiddle playing, from classical to jazz, while his background in traditional music is never far from the fore, being recognised as one of the finest young fiddle players in the ascendancy. He plays an unusal five string violin (ie violin/viola), giving more range to his playing for song arrangements and especially in live concerts. His fiddle solos at Danú concerts are a major highlight of the show.