Gibson-Park made his debut 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. 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.
In 2013 he was signed by the Super Rugby side the Blues. He earned his first Super Rugby start in the Blues historic 21–28 loss over the Bulls in round four of the competition. Gibson-Park was also a part of the memorable Blues team to face France, getting his chance cause of injury with All Blacks halfback Piri Weepu. 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. Gibson-Park recorded one try while also being pointed out by many commentators as a key figure for the Blues in what was his final season.
Hurricanes
October 2015, Gibson-Park was the last to join the Hurricanes 39-man Super Rugby squad after head coachChris Boyd looked to fill gaps at halfback after the departure of Chris Smylie to Italy. He joined alongside fellow Taranaki halfback Te Toiroa Tahuriorangi.
Leinster
On 12 May 2016, Park left New Zealand to join Irish region Leinster in the Pro12 ahead of the 2016-17 season. 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.
International career
Māori All Blacks
Although the then 20-year-old Gibson-Park had only played eleven matches for Taranaki, Jamie Joseph, the Māori All Blacks coach, selected him for the 2012 end of year tour to England, playing against domestic club team Leicester Tigers, a specially made RFU Championship XV, and ending against the Canadian national team.
Irish Qualification
In 2019, Gibson-Park became eligible to play for Ireland under the World Rugby's eligibility rules.