Adam Silver became the NBA’s fifth commissioner Saturday. “It’s official: Adam Silver succeeds David Stern as NBA Commissioner,” the NBA said on its Twitter feed. Stern retired after exactly 30 years in charge, making him the NBA’s longest-serving and most successful commissioner. Silver joined the NBA as his assistant in 1992 and has been the deputy commissioner since 2006. Stern originally announced his retirement Oct. 25, 2012, and owners unanimously chose Silver as his successor.