Getty President of Basketball Operations Brad Stevens of the Boston Celtics is facing the most challenging offseason of his tenure. The Boston Celtics are navigating a challenging summer in the wake of their roster teardown following the devastating Achilles injury to their franchise star Jayson Tatum . While they have plenty of openings in their roster following the departures of Jrue Holiday , Kristaps Porzingis , Luke Kornet and likely Al Horford , the Celtics are facing a stiff challenge to