He moved to the Boston Red Sox as assistant general manager in 2003 and was with the team in 2004 when they won their first World Series title since 1918.
Byrnes was executive vice president and general manager of the Arizona Diamondbacks (2005-2010) and the San Diego Padres (2011-2014).
Byrnes grew up in Washington, D.C., where he attended and played second base for St. Albans School, breaking the single-season hits record.
He's got as much a feel for evaluating and statistical analysis as anyone in baseball.” [7] Byrnes joined the Arizona Diamondbacks as general manager in 2006, where he remained until July 1, 2010.
Charged with reducing payroll and adding youth to the roster, Byrnes pushed the team forward towards contention.
The move was considered unorthodox because of Hinch's prior front office position in player development, rather than in on-field coaching.
After Byrnes left the team in 2010, the Diamondbacks won the division in 2011 with a lower-third payroll from a roster he had largely constructed.
In a 15-year span, Arizona trails only Tampa Bay, Cleveland and Oakland in producing 90-win seasons with a lower-third payroll.
Max Scherzer (2006), Paul Goldschmidt (2009), AJ Pollock (2009) and Adam Eaton (2010) are a few of the notable picks from those drafts.
In the three drafts he oversaw from 2012-2014, the Padres selected Trea Turner, Max Fried, Hunter Renfroe and Zach Eflin with their first-round picks.
Additionally, Fried and Turner would receive Cy Young Award and MVP votes, respectively, and represent the NL in the All-Star game.
Byrnes also engineered a trade with Cincinnati to acquire Yasmani Grandal, Yonder Alonso and Brad Boxberger, who all became All-Stars.
Baseball America called Los Angeles the model franchise in the sport during his tenure as senior vice president.