[4] Despite being promoted to the senior squad, he didn't make his debut for the side until 23 April 2010, when he came on as a replacement against Glasgow Warriors in the 2009–10 Celtic League.
Harris-Wright made his European debut for Leinster in a 2010–11 Heineken Cup pool stage game against Racing Metro on 9 December 2010.
[5] Harris-Wright played in four Heineken Cup games, including the final against Northampton Saints which Leinster won, with all of these appearances coming from the bench.
[6] Harris-Wright stayed with Leinster through summer 2011, playing preseason matches with the team,[7] but the signing of Seán Cronin meant he was no longer as prominent a member of the squad.
Despite topping their Group in Stage 2 of the competition however, Bristol were beaten by Cornish Pirates 63–53 on aggregate in the play-off semi-finals and missed out on promotion.
[11] He made 14 league appearances in his debut season, all but two of these coming as starts, and scored his first try for the side in a Pro12 game against Edinburgh on 1 December 2012.
[6] In the following season, Harris-Wright continued to feature regularly, playing 18 times in the 2013–14 Pro12 and in all six of Connacht's group games in the 2013–14 Heineken Cup.
[14] Towards the end of the season however, Harris-Wright suffered a dislocated shoulder against Cardiff Blues and was ruled out for six months.