 He started out his tenure quietly. He acquired Al Horford, and he got rid of a rapidly declining Kemba Walker and a late first. He followed that up by striking a deal. He picked up the Spurs guard Derek White. The Celtics shipped off Josh Richardson, Romeo Lankford, and some future draft capital in exchange for the future All-NBA defender. Fast forward to this past offseason. Stevens turned Marcus Smart into former All-Star Kristaps Porzingis in two future first-round picks.