He played a number of sports growing up, including golf in Elm Park, mini rugby in Old Belvedere, Gaelic Football with Kilmacud Crokes and tennis in Blackrock Bowling & Tennis club.
He attended Blackrock College and captained their rugby side to the Leinster Schools Cup in 2022.
[3][4][5] Gus made his debut for Leinster Rugby in April 2024 away in South Africa against Stormers.
That same year he captained the Ireland U20 side to final of the World Rugby U20 Championship in Cape Town, South Africa, where the team placed second overall.
[10] In November 2024, he made his debut in a 52-17 win against Fiji scoring a try in the 2024 Autumn Nations Series.