Portland Trail Blazers (2021–2023) Brown was selected in the second round of the
2021 NBA draft with the 43rd pick by the
New Orleans Pelicans. He was then traded to the
Portland Trail Blazers for a future second-round draft pick and cash considerations. Brown joined the Trail Blazers for the
2021 NBA Summer League. On August 12, 2021, he signed a 3-year, $4.3 million rookie scale contract with the Trail Blazers. On October 23, Brown made his NBA debut, logging four points and three rebounds in a 134–105 blowout win over the
Phoenix Suns. On February 8, 2022, he scored a season-high 15 points, along with eight rebounds, in a 95–113 loss to the
Orlando Magic. On March 23, in a 96–133 blowout loss to the
San Antonio Spurs, Brown grabbed a season-high 14 rebounds, along with seven points and two blocks. On February 9, 2023, Brown was waived by the Blazers.
San Diego Clippers (2023) On March 2, 2023, Brown was acquired by the
Ontario Clippers.
Dallas Mavericks (2023–2024) On August 14, 2023, Brown signed with the
Dallas Mavericks and on October 21, his deal was converted into a
two-way contract. Brown reached the
NBA Finals where the Mavericks lost to the
Boston Celtics in five games.
Mexico City Capitanes (2024–2025) On October 28, 2024, Brown joined the
Mexico City Capitanes.
Calgary Surge (2025) On April 2, 2025, Brown signed with the
Calgary Surge of the
Canadian Elite Basketball League. Brown averaged 19.7 points, 8.2 and 1.8 blocks in 23 games played with Calgary. He was the runner-up for CEBL Defensive Player of the Year and was named a CEBL First Team All Star.
AEK Athens (2025–present) On November 12, 2025, Brown III signed with
AEK Athens of the
Greek Basket League. On March 16, he extended his contract with the club until 2027. ==Career statistics==