| Position | D |
| Birth city | Charlestown, Massachusetts, USA |
| Birth date | 1994-01-05 (32) |
| Height | 5'10'' |
| weight (lb) | 180 |
| Drafted | pick 24 round 3 by BOS in 2012 |
season | L | T. | GP | G | A | PTS | +/- | pim |
|---|---|---|---|---|---|---|---|---|
| 2016-17 | NHL | Boston Bruins | 2 | 0 | 0 | 0 | 0 | 2 |
| 2017-18 | NHL | Boston Bruins | 61 | 3 | 12 | 15 | 21 | 22 |
| 2018-19 | NHL | Boston Bruins | 66 | 3 | 15 | 18 | 9 | 68 |
| 2019-20 | NHL | Boston Bruins | 68 | 4 | 17 | 21 | 15 | 34 |
| 2020-21 | NHL | Boston Bruins | 37 | 5 | 15 | 20 | 11 | 22 |
| 2021-22 | NHL | Boston Bruins | 73 | 4 | 20 | 24 | 22 | 24 |
| 2022-23 | NHL | Boston Bruins | 75 | 4 | 22 | 26 | 46 | 28 |
| 2023-24 | NHL | Boston Bruins | 63 | 2 | 9 | 11 | 13 | 37 |
| 2024-25 | NHL | Pittsburgh Penguins | 82 | 1 | 39 | 40 | -6 | 16 |
| 2025-26 | NHL | Chicago Blackhawks | 69 | 0 | 12 | 12 | -9 | 32 |
| 2026-27 | NHL | Buffalo Sabres | 1 | 0 | 0 | 0 | -1 | 0 |
| NHL Total | 597 | 26 | 161 | 187 | 121 | 285 | ||
season | L | T. | GP | G | A | PTS | +/- | pim |
|---|---|---|---|---|---|---|---|---|
| 2017-18 | NHL | Boston Bruins | 11 | 0 | 1 | 1 | -2 | 4 |
| 2018-19 | NHL | Boston Bruins | 20 | 4 | 4 | 8 | -3 | 6 |
| 2019-20 | NHL | Boston Bruins | 12 | 0 | 1 | 1 | -5 | 4 |
| 2020-21 | NHL | Boston Bruins | 11 | 1 | 3 | 4 | -2 | 4 |
| 2021-22 | NHL | Boston Bruins | 5 | 0 | 0 | 0 | -6 | 6 |
| 2022-23 | NHL | Boston Bruins | 4 | 0 | 0 | 0 | -1 | 0 |
| 2023-24 | NHL | Boston Bruins | 3 | 0 | 0 | 0 | 0 | 2 |
| NHL Total | 66 | 5 | 9 | 14 | -19 | 26 | ||