Born Aug 8, 1980 · New Haven, CT · age 45
A former MLB pitcher and Yale graduate turned Boston Red Sox chief baseball officer, hired to modernize the club's pitching development and analytics.
3 seasons with salary-era data across 1 stint. All figures are franchise-level outcomes during the tenure, not solely attributable to one executive.
| Team | Role | Years | Szns | WAB | WAB/yr | TAB | WAR surp | HG | Trade | FA | R5 | AcqLev | W-L% | PO | Pen | WS | Surp $M |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
▸  Red Sox |
POBO/GM | 2024–present | 3 | +6.0 | +2.00 | +16.6 | -3.2 | +8.5 | +2.3 | +1.6 | -0.3 | 2.72 | 0.523 | 1 | – | – | -21 |
| Career total (1985+ data) | 3 | +6.0 | +16.6 | -3.2 | +8.5 | +2.3 | +1.6 | -0.3 | 2.72 | 0.523 | 1 | – | – | -21 | |||
Acquired minus surrendered / signed minus walked.
Every roster slot ranked best→worst by WAR, averaged across Craig Breslow's seasons. Bars = his rosters; the black line = the league-average player at each slot. Staying above the line deep into the roster is the depth edge.
| Player | Pos | Team | How | Year | Szns | fWAR | WAR/yr | Lev |
|---|---|---|---|---|---|---|---|---|
| Garrett Crochet | P | BOS |
Trade | 2024 | 2 | +6.1 | +3.1 | 22.4 |
| Aroldis Chapman | P | BOS |
Free agency | 2024 | 2 | +3.7 | +1.8 | 9.9 |
| Alex Bregman | 3B | BOS |
Free agency | 2025 | 1 | +3.5 | +3.5 | 13.3 |
| Willson Contreras | C | BOS |
Trade | 2025 | 1 | +3.3 | +3.3 | 5.5 |
| Roman Anthony | DH/OF | BOS |
Draft | 2025 | 2 | +3.0 | +1.5 | – |
| Ranger Suarez | P | BOS |
Free agency | 2026 | 1 | +3.0 | +3.0 | 5.1 |
| Carlos Narváez | C | BOS |
Trade | 2024 | 2 | +2.8 | +1.4 | 10.0 |
| Tyler O'Neill | OF | BOS |
Trade | 2024 | 1 | +2.5 | +2.5 | 11.7 |
| Payton Tolle | P | BOS |
Draft | 2025 | 1 | +2.1 | +2.1 | – |
| Lucas Giolito | P | BOS |
Free agency | 2024 | 1 | +2.0 | +2.0 | 7.3 |
| Connelly Early | P | BOS |
Draft | 2025 | 2 | +1.8 | +0.9 | – |
| Sonny Gray | P | BOS |
Trade | 2026 | 1 | +1.8 | +1.8 | 3.5 |
| Romy Gonzalez | 1B/2B | BOS |
Trade | 2024 | 2 | +1.6 | +0.8 | 1.1 |
| Caleb Durbin | 3B | BOS |
Trade | 2026 | 1 | +1.5 | +1.5 | 3.0 |
| Isiah Kiner-Falefa | SS | BOS |
Free agency | 2026 | 1 | +1.1 | +1.1 | 2.4 |
| Greg Weissert | P | BOS |
Trade | 2024 | 2 | +1.1 | +0.6 | 2.4 |
| Cooper Criswell | P | BOS |
Trade | 2024 | 1 | +1.1 | +1.1 | 5.1 |
| Hunter Dobbins | P | BOS |
Draft | 2025 | 1 | +1.0 | +1.0 | – |
| Justin Wilson | P | BOS |
Free agency | 2024 | 1 | +1.0 | +1.0 | 3.7 |
| Sean Newcomb | P | BOS |
Trade | 2025 | 1 | +0.7 | +0.7 | 2.6 |
| Tayron Guerrero | P | BOS |
Free agency | 2026 | 1 | +0.6 | +0.6 | 1.3 |
| Patrick Sandoval | P | BOS |
Free agency | 2024 | 1 | +0.5 | +0.5 | 1.1 |
| Anthony Seigler | 2B/3B | BOS |
Trade | 2026 | 1 | +0.5 | +0.5 | 1.0 |
| Nate Eaton | 3B/OF | BOS |
Free agency | 2024 | 2 | +0.4 | +0.2 | 1.2 |
| Nick Sogard | 2B/3B | BOS |
Draft | 2024 | 2 | +0.4 | +0.2 | – |
| Nathaniel Lowe | 1B | BOS |
Trade | 2025 | 1 | +0.4 | +0.4 | 1.6 |
| Kyle Harrison | P | BOS |
Trade | 2025 | 1 | +0.4 | +0.4 | 1.3 |
| Cam Booser | P | BOS |
Draft | 2024 | 1 | +0.3 | +0.3 | – |
| Luis Guerrero | P | BOS |
Draft | 2024 | 1 | +0.3 | +0.3 | – |
| Marcelo Mayer | 2B/3B | BOS |
Draft | 2025 | 1 | +0.3 | +0.3 | – |
| Jovani Morán | P | BOS |
Trade | 2024 | 2 | +0.3 | +0.1 | 0.1 |
| Tyler Samaniego | P | BOS |
Trade | 2025 | 1 | +0.2 | +0.2 | – |
| Nick Burdi | P | BOS |
Free agency | 2025 | 1 | +0.1 | +0.1 | 0.3 |
| Eduardo Rivera | P | BOS |
Draft | 2026 | 1 | +0.1 | +0.1 | – |
| Chase Shugart | P | BOS |
Draft | 2024 | 1 | +0.1 | +0.1 | – |
| Naoyuki Uwasawa | P | BOS |
Trade | 2024 | 1 | +0.1 | +0.1 | – |
| José De León | P | BOS |
Trade | 2025 | 1 | +0.1 | +0.1 | 0.4 |
| Quinn Priester | P | BOS |
Trade | 2024 | 1 | +0.1 | +0.1 | 0.5 |
| Jhostynxon Garcia | OF | BOS |
Draft | 2025 | – | -0.0 | – | – |
| Liam Hendriks | P | BOS |
Free agency | 2024 | – | -0.0 | – | – |
| Andruw Monasterio | 2B/3B | BOS |
Trade | 2026 | – | -0.0 | – | – |
| Zach Penrod | P | BOS |
Draft | 2024 | – | -0.0 | – | – |
| Dominic Smith | 1B/OF | BOS |
Free agency | 2024 | 1 | -0.0 | -0.0 | 1.6 |
| Ryan Watson | P | BOS |
Trade | 2025 | – | -0.0 | – | – |
| Tyler Heineman | C | BOS |
Trade | 2024 | 1 | +0.0 | +0.0 | 0.1 |
| Danny Jansen | C | BOS |
Trade | 2024 | 1 | +0.0 | +0.0 | 0.1 |
| Tsung-Che Cheng | SS | BOS |
Trade | 2026 | 1 | +0.0 | +0.0 | 0.1 |
| Danny Coulombe | P | BOS |
Free agency | 2026 | – | -0.1 | – | – |
| Tommy Kahnle | P | BOS |
Free agency | 2026 | – | -0.1 | – | – |
| Johan Oviedo | P | BOS |
Trade | 2025 | – | -0.1 | – | – |
| Robert Stock | P | BOS |
Free agency | 2025 | 1 | -0.1 | -0.1 | 0.3 |
| Tyler Uberstine | P | BOS |
Draft | 2026 | – | -0.1 | – | – |
| Jamie Westbrook | 2B | BOS |
Rule 5 | 2024 | – | -0.1 | – | – |
| Kristian Campbell | 2B | BOS |
Draft | 2025 | – | -0.2 | – | – |
| Isaiah Campbell | P | BOS |
Free agency | 2024 | – | -0.4 | – | – |
| Bailey Horn | P | BOS |
Trade | 2024 | – | -0.5 | – | – |
| Mickey Gasper | C/DH | BOS |
Draft | 2024 | – | -0.6 | – | – |
| Abraham Toro | 2B/3B | BOS |
Free agency | 2025 | – | -0.7 | – | – |
WAB = wins above what the team's payroll predicted (resource-controlled). WAR surplus = era-neutral value (WAR minus payroll in win-equivalents). Roster surplus $M = dollar value of WAR over cost. Build channels (realized fWAR): HG = home-grown via amateur draft / international signing; Trade = acquired minus surrendered (incl. purchases/waivers); FA = signed minus walked; R5 = Rule-5 / minor-league-draft pickups. Credit follows the acquisition year — home-grown to the regime at the player's draft/signing (not whoever was in the chair when he peaked), trade/FA/R5 to the GM who made the move. Players acquired as prospects before debuting (e.g. Smoltz, Bagwell; Rule-5 picks like Uggla) are counted as trade/R5, not home-grown. All are franchise-level outcomes during the stint, not solely attributable to one executive.