The 54-year-old is 117-52-22 in 191 games with the Bruins, a .670 points percentage that's fourth in their history, and reached 100 wins in 166 games; only Tom Johnson (138 games) did it faster for them. Boston has 256 points since Cassidy replaced Claude Julien on Feb. 7, 2017, second in the NHL during that span behind the Tampa Bay Lightning (283).
"It's not about people deserving things; he's earned this right to lead this club," Bruins general manager Don Sweeney said. "That doesn't just start from two years ago; it starts from a number of years ago when I got to know Bruce really well working with him. To me, those translate into a lot of the ideals that he has as a coach, and an everyday approach."
The Bruins were 49-24-9 last season, second behind the Lightning in the Atlantic Division and Eastern Conference. Boston defeated the Toronto Maple Leafs, Columbus Blue Jackets and Carolina Hurricanes in the Stanley Cup Playoffs before losing the Cup Final to the St. Louis Blues.
Bruins president Cam Neely said he likes the way Cassidy's teams push the pace.
"The record speaks for itself, but just the up-tempo, focus on trying to score goals," Neely said. "I think everybody enjoys that style of play but also understanding that you've got to play well to finish in the League, you've got to play well in your own end, you've still got to check. Those are the things I noticed right away, and I thought our guys really gravitated and adapted to it and enjoyed that. Even in practices, I thought our practices were certainly an indication for how we were going to play."