Both Pierceson and his twin brother, Parker (who is 37 minutes older than Pierceson), are third-generation professional golfers, as their father, Kyle, played collegiately at University of Texas (1983-87) and made over 20 Korn Ferry Tour starts from 1990-96, and grandfather, Charles, played on the PGA TOUR from the 1960s through the mid-1980s, winning three times on TOUR, including the 1971 Masters Tournament.

Father, Kyle, also played the Asian Tour and Canadian Tour and Korn Ferry Tour. Grandfather, Charles, played on PGA TOUR Champions following his PGA TOUR career.

While at Plano (Texas) West High School, won a team state title in 2016; he and his twin brother, Parker, followed in the footsteps of their father, Kyle, with the team state title, as Kyle and four-time PGA TOUR winner Bob Estes led Abilene Cooper High School to back-to-back 5A team state titles in 1982 and 1983 (Estes won the individual title and Kyle finished second in 1983).

In his grandfather Charles Coody's final appearance at the Masters in 2006, Pierceson and his twin brother Parker (both age 6 at the time) caddied for Charles in the par 3 contest. The twins putted on alternate holes, with Pierceson making a 40-footer on No. 9.

Finished No. 1 in the PGA TOUR University Class of 2022, earning Korn Ferry Tour membership and exemptions for the remaining open-field events in the 2022 season, as well as an exemption to Final Stage of the 2022 Korn Ferry Tour Qualifying Tournament.

Played collegiately for four seasons at University of Texas (2018-22), garnering three All-America honors, including first-team selections in 2021 and 2022, along with a second-team laurel in 2020.

Helped Texas win its fourth national title at the 2022 NCAA Championships, defeating Arizona State's Preston Summerhays in the title round.

Named 2021 Big 12 Conference Player of the Year, joining a list of past Texas winners which includes Dylan Frittelli (2010), Jordan Spieth (2012), Beau Hossler (2015, 2016) and Doug Ghim (2017).

2021 Ben Hogan Award finalist as a junior alongside Georgia's Davis Thompson and Florida State's John Pak.

Won the 2020 Western Amateur at Crooked Stick Golf Club in Carmel, Indiana, as well as the 2019 Trans-Mississippi Amateur.