Cormac O'Brien is one of Dublin’s most prominent double bass players and he has performed and recorded with many of Ireland’s finest musicians, such as Louis Stewart, Tommy Halferty, Michael Buckley, Hugh Buckley, The Kai Big Band, The Zoid Ensemble, Lunfardia, Yurodny and Jack L. He has also played with a range of international artists such as Bobby Watson, Pete Churchill, Ernie Watts, Marshall Gilkes, Rick Margitza, Ryan Quigley, John Riley, Bruce Adams and many more. He has held the bass chair in the Dublin City Jazz Orchestra since its inception and is a member of the Hibernian Orchestra. Cormac also co-founded the group Rhythm Method, for whom he also composes. Other current projects he is involved include Mary Coughlan band, Phisqa, Inni-K and Riona Hartman band. In 2012 Cormac set up the Jazz Central, a short lived but successful jazz venue, and has been involved with other collectives such as Rutland place and Donkey Jaw Productions.