[3] His father Chris had attended Blackrock College,[1] final year 1980, playing rugby at centre.

[1] After leaving school in 2016, Doris spent a year in the Leinster sub-academy before entering the academy in summer 2017.

[5] On 18 December 2023, the IRFU announced that Doris had been given a three-year 'central contract' paid by the union, extending his time at Leinster until July 2027.

[8] Doris received his first call up to the senior Ireland squad for the 2020 Six Nations Championship,[9] and made his debut when he started at number 8 in Ireland's opening fixture against Scotland on 1 February 2020, though a concussion meant that his debut lasted only four minutes.

[11] On 11 February 2024, Doris captained the Ireland team for the first time in their game against Italy in the Six Nations Championship.