"[1] In his sophomore season, he led La Lumiere to the Dick's Sporting Goods championship and a 29–1 record while averaging 11.3 points and 7.8 assists per game.

[3] Following his sophomore season, Campbell reclassified to the class of 2018 because he was ahead academically and felt he was ready for college basketball.

This performance was a part of a three-game run in which Campbell averaged 15.7 points per game, which he credited to coach Mick Cronin urging him to be more aggressive offensively.

[4] After posting his first double-double of 15 points and 11 assists in a 70–63 win over Colorado, Campbell was named Pac-12 freshman of the week on February 24.

He led UCLA to a 2–0 record while averaging 14 points along with seven assists per game and shooting 61 percent, including 5-of-8 on his three-point field goals.

After the season, he declared for the 2023 NBA draft, forgoing the extra year of eligibility granted due to the COVID-19 pandemic.

[28] On August 3, 2023, he signed with Saint-Quentin Basket-Ball of LNB Pro A, the top-tier men's professional basketball league in France.

[29][30] On 10 July 2024 Rasta Vechta of the German Basketball Bundesliga (BBL) signed Campbell for one year as new playmaker.