[5] On January 14, 2019, as a junior, he was named Los Angeles Daily News boys athlete of the week following two consecutive games with at least 34 points.

[9][10] Williams was not eligible to play until December 29, due to CIF Southern Section (CIF-SS) transfer rules, and missed more than 10 games.

[13] As a senior, he averaged 15 points, 7.9 rebounds and 3.6 assists per game, helping Sierra Canyon win the CIF-SS Open Division title.

[16][17] Sources: In his collegiate debut for Stanford on November 30, 2020, Williams scored 19 points and grabbed eight rebounds in an 82–64 win against Alabama.

[20] On July 29, 2021, Williams was selected with the tenth overall pick in the 2021 NBA draft by the New Orleans Pelicans, then traded to the Memphis Grizzlies.

[21] After missing 14 consecutive games due to an ankle injury and a stint in the NBA's COVID-19 protocols,[22] Williams got his first career start on January 6, 2022, recording 14 points and two steals in a 118–88 win over the Pistons.

[28] He made his season debut on December 7, recording four points, six rebounds, three assists and two steals in a 123–102 win over the Oklahoma City Thunder.

[29] On July 19, 2024, Williams was traded to the Brooklyn Nets alongside a second-round pick in exchange for Mamadi Diakite and the draft rights to Nemanja Dangubić.