[5] Having begun his karting career aged two when his father Greg bought him a go-kart, Pierson soon began competing in regional and national competitions.

The American would return to the USF2000 Championship the following year, this time as part of the Pabst Racing outfit alongside Jace Denmark and Yuven Sundaramoorthy.

[18] Despite finishing second during the race, the result would only yield third in the teams' championship for Pierson and Jarvis, though the American would receive an award for being the "Revelation of the Year" of the 2022 WEC campaign.

[24] Pierson re-signed with United Autosports to compete in the 2023 WEC season, once again partnering Oliver Jarvis, with a revolving door of drivers claiming the lineup's third seat.

[3] As well as that, it was announced that Pierson would join series newcomer TDS Racing for that year's endurance rounds of the IMSA SportsCar Championship.

However, their strong race came undone as an onboard camera inside of Pierson's car came loose and hit the ignition switch, pushing it out and causing the #23 United to come to a halt, forcing them to retire in what managing director Richard Dean described as "a one in a million thing".

[27] The Centenary 24 Hours of Le Mans did not yield much success, as Blomqvist experienced a crash following a loss of brakes, leading to an eighth-placed finish, meanwhile Pierson and the team would miss out on a podium again during the Monza round, as a last-lap pass from Deléteaz on Jarvis relegated the #23 to fourth by the flag.

[28][29][30] Fuji ended up burying any remaining title ambitions for the American, who finished fourth alongside Jarvis and Ben Hanley; Pierson had shown impressive pace, though he was also involved in a collision with Rui Andrade for which he was given a 10-second penalty which set the team back, before Hanley lost further time when he was hit by João Paulo de Oliveira's Vanwall.