His journalism work has included stints with Comhar and the Sunday Tribune and he also spent time as a reporter with TG4.

Mac Coille regularly interviewed politicians such as Gerry Adams[6] and Eoin Ryan Jnr,[7] and breakfasted politically with CNN broadcaster Larry King on Super Tuesday in February 2008.

[3][10] Mac Coille was part of a crew of RTÉ employees who travelled to the United States to cover the Super Tuesday election event, a move which was later criticised when the true cost emerged.

[10] In September 2010 on Morning Ireland Mac Coille received a controversial nine-minute live interview from Taoiseach Brian Cowen at a Fianna Fáil think-in in Galway; the interview received international attention and led to increased pressure on Cowen to resign in the days that followed.

[11][12][13][14] Mac Coille grew up in Clondalkin and attended school at Coláiste Mhuire in the city centre,[3] before moving to Phibsborough in Dublin.