Dionne Calhoun, Keith Belton (Dallas Mavericks)
May 2025 (following 2024–25 season)
The Dallas Mavericks dismissed head athletic trainer Dionne Calhoun and performance director Keith Belton after a season plagued by injuries and internal conflicts. Calhoun had been with the franchise for 21 years, while Belton was under scrutiny for lacking required NBA certifications.
The firings followed a season of medical mismanagement, including a key incident involving Dereck Lively II’s stress fracture. An internal HR investigation was triggered by a heated dispute between Belton and health director Johann Bilsborough, who remains with the team. This marks the third straight offseason of major performance staff changes.