Gibson-Park debuted for Taranaki in 2012, playing the season's first two Ranfurly Shield matches against King Country and Wanganui. He was contracted and made the Taranaki National Provincial Championship squad, making his NPC debut starting at scrum-half against Bay of Plenty. He made an immediate impact with his decisive running and ability to spot a gap. His ability to put a player into space also caught the eye. Gibson-Park was one of the then break-out stars of the 2012 ITM Cup in his debut year for Taranaki, scoring four tries in eleven appearances and was awarded the most promising player of the year ahead of finalists Mitch Brown and Seta Tamanivalu.[8] His performance didn't go unnoticed by the national media or the Super Rugby coaches. He received high praise from television, print and radio commentators and had been named one of the five promising players of the year by the Rugby Almanack.[9]
In 2013 he was signed by the Super Rugby side the Blues. He earned his first Super Rugby start in the Blues 21–28 loss to the Bulls in round four of the competition. Gibson-Park was also a part of the Blues team to face France, getting his chance because of injury with All Blacks halfback Piri Weepu.[10]
Gibson-Park had a slow start to the 2014 Super Rugby season because of stress fracture but finished the season appearing in two matches of rounds ten and eighteen coming on as a replacement against the Hurricanes and Crusaders. 2015 was a strong year as he started at halfback majority of the year, who along with Brendon O'Connor were the only players who had played in every game that season for the Auckland franchise.[11] Gibson-Park recorded one try while also being pointed out by many commentators as a key figure for the Blues,[citation needed] in what was his final season.
On 12 May 2016, Park left New Zealand to join Irish province Leinster in the Pro12 ahead of the 2016–17 season.[13]
In September 2017, Gibson-Park and Leinster captain Isa Nacewa were denied entry in to South Africa due to visa restrictions. The pair had been due to play two matches for Leinster in the Pro14 against the Southern Kings and the Cheetahs.[14] He made his 100th appearance for Leinster coming off the bench in a 16–6 victory over Munster in the 2021 Pro14 Grand Final.[15][16] Gibson-Park was selected in Leinster's defeat to La Rochelle in the 2023 European Rugby Champions Cup final.[17]
In November 2021, he was selected as the starting scrum-half for Ireland's test against Japan,[21] scoring his first international try in a 60–5 victory. He kept his place for the visit of New Zealand a week later and played a key role in a 29–20 win over his native country.[22] His performance against New Zealand earned him praise for his speed of service and work-rate in defence.[23] He scored a try in Ireland's 30–24 loss against France in the 2022 Six Nations, and then another against Italy two weeks later in a 57–6 win.
On 18 December 2023, the Irish Department of Justice announced that Jamison Gibson-Park had become a citizen of Ireland.[5]
