He previously served as a Minister of State from July 2020 to January 2025, and as a Teachta Dála (TD) for the Carlow–Kilkenny constituency from February 2020 to November 2024.

[2] Before entering politics, Noonan worked for twenty years as a community and environmental activist with Friends of the Earth.

Maria Dollard was co-opted to Noonan's seat on Kilkenny County Council following his election to the Dáil.

[6] On 1 July 2020, he was appointed by the Fianna Fáil–Fine Gael–Green coalition government as Minister of State at the Department of Housing, Local Government and Heritage with responsibility for Nature, Heritage and Electoral Reform.

[7][8][9][10] Noonan lost his Dáil seat at the 2024 general election.