This success garnered him a job with the NBA's Boston Celtics in 2013, when he signed a six-year, $22-million-dollar contract to become head coach. After undertaking a rebuild early in his career, Stevens has led the Celtics to the NBA playoffs every year since 2014, won a division championship, and appeared in the Eastern Conference Finals in 2017, 2018, and 2020. He has gained a reputation as one of the NBA's best coaches, with his motion offense and stingy defense earning plaudits from fans, peers, and players.