Ron Harper Jr. has signed with the Boston Celtics as a free agent. Ron Harper Jr. has rejoined the Boston Celtics as a free agent. The signing occurred on August 16, 2025, after he was waived by the Detroit Pistons in July. Harper Jr. returns to Boston, where he had a brief stint in December 2024. In recent games, he has not recorded any player stats, indicating limited playtime before rejoining the Celtics.