Hazen joined the Cleveland Indians as an intern[4] then became one of the club's advance scouts in 2001–02. Promoted to assistant director of professional scouting in 2003, he then spent two full seasons (2004–05) as Cleveland's assistant director of player development, working directly under John Farrell, who would serve as manager of the Red Sox from 2013–17.[3]
Hazen initially came to the Red Sox as director of player development in February 2006 (Farrell would follow as the team's pitching coach eight months later), and then was named vice president, player development and amateur scouting, in 2011. He was promoted to vice president and assistant general manager (under Cherington) in 2012, then named a senior vice president and assistant GM in early 2015.[3] On September 23, 2015, Hazen was named general manager by the Red Sox' president of baseball operations, Dave Dombrowski.[5] Although Dombrowski assumed final authority for baseball decisions, Hazen served as a top aide and had input in the club's decision-making.[6]
During his one full season in the post, Boston won the 2016 American League East Division championship, but fell in the ALDS to the eventual league champions, the Indians.
On October 16, 2016, Hazen agreed to become the executive vice president and general manager of the Arizona Diamondbacks,[7] to serve as the team's top baseball operations executive.
On June 11, 2021, Hazen announced he would be taking a physical leave of absence to spend more time with his wife Nicole, who was battling brain cancer. Hazen stated that he didn’t feel he could devote the time required to lead the team’s trade deadline and draft preparation while attending to his family responsibilities.[8]
Personal life
Hazen's wife Nicole died of cancer on August 4, 2022.[9] They had four sons together.[10]
Note: Those listed here hold one or more of the titles President of Baseball Operations, Vice President of Baseball Operations, Chief Baseball Officer, or General Manager and in each case have final say in personnel decisions.