[1] He played for several clubs in Sussex, including winning the national U-17s Bowl with Heathfield and Waldron in 2012,[3] before joining Eastbourne College where he was coached by Russell Earnshaw.
[4] O'Conor played for the England U20 side that won the 2015 Six Nations Under 20s Championship and scored his only try of the tournament in a win over Ireland at Donnybrook Stadium.
[5][6] Later that year he was a member of their squad at the 2015 World Rugby Under 20 Championship and had a try disallowed in the final against New Zealand which England lost to finish runners up.
[9] O'Conor scored four tries in twenty matches during the 2018–19 Premiership Rugby campaign and his form led to him being selected by coach Eddie Jones to start for an England XV against Barbarians in an uncapped match at Twickenham Stadium on 2 June 2019.
[12] In April 2024 it was announced that O'Conor would join Connacht for the 2024–25 United Rugby Championship.