[2] Fisher-Harris played his junior rugby league for the Whangarei Marist Brothers[citation needed], before being signed by the Penrith Panthers.

[7] On 4 October 2015, Fisher-Harris played in the 2015 Holden Cup Grand final against the Manly-Warringah Sea Eagles, starting at second-row in the 34-18 victory.

[15] On 11 November 2016, Fisher-Harris made his international debut for New Zealand against Scotland, playing off the interchange bench in the shock 18-18 all draw at Derwent Park in Workington, England.

[19] Fisher-Harris made a total of 24 appearances for Penrith in the 2019 NRL season and scored two tries as the club finished 10th on the table and missed out on the finals for the first time since 2015.

[23] In round 21 of the 2022 NRL season, Fisher-Harris was sent to the sin bin for a dangerous high tackle in Penrith's victory over Canberra.

[27] On 18 February, Fisher-Harris played in Penrith's 13-12 upset loss to St Helens RFC in the 2023 World Club Challenge.

[29] On 6 December, Fisher-Harris was presented with the Golden Boot award, recognised as the best international player for the year after captaining New Zealand to winning the inaugural Pacific Championships, including a record 30-0 victory over Australia in the final.

[31] On 17 April, Fisher-Harris was granted a release from his Penrith contract on compassionate grounds and signed a four-year deal with the New Zealand Warriors, starting in 2025.