On 3 March 2012, he was introduced as a substitute when St Kieran's College defeated local rivals Kilkenny CBS by 2–09 to 1–10 to win the Leinster Championship.
On 3 March 2013, Maher lined out at centre-back when St. Kieran's College faced Kilkenny CBS in a second successive Leinster final.
On 9 March 2014, he lined out at centre-back when St Kieran's College suffered a 2–13 to 0–13 defeat by Kilkenny CBS in the Leinster final.
[4] Maher joined the St Lachtain's club at a young age and played in all grades at juvenile and underage levels.
On 3 July 2011, he scored 1-01 from play after coming on as 38th-minute substitute for Conor Martin in Kilkenny's 1–14 to 1–11 defeat by Dublin in the Leinster final.
He made his first appearance for the team on 14 February 2016 when he was introduced as a 48th-minute substitute for Mark Kelly at left corner-forward in a 0–14 to 0–10 defeat by Waterford.
[11] On 3 July 2016, Maher won a Leinster Championship medal as a member of the extended panel following Kilkenny's 1–26 to 0–22 defeat of Galway in the final.