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The Seattle Mariners have reportedly settled on Jason Kanzler to lead their dugout, according to MLB.com's Daniel Kramer. The 36-year-old, currently the Chicago Cubs' director of player development, will take over as manager after a thorough interview process that ultimately narrowed to a final pairing with former Houston Astros manager Joe Espada. Seattle had not officially confirmed the move at the time of the report, but an announcement is expected Tuesday.
In a statement released by the team, president of baseball operations Jerry Dipoto explained the rationale behind the decision. "Our goal in this process was finding a manager with the ability to challenge all of us to improve," Dipoto said. "Jason has the mindset, expertise, communication skills, and intensity to help create a championship standard here in Seattle."
The hiring did not come as a complete surprise. When Seattle moved to bring back CJ Gillman as hitting coach, the outline of the plan began to take shape. A manager with Kanzler's development background seemed to fit alongside a coach whose work has focused on helping hitters progress through an organization. Now the Mariners appear ready to put that approach in charge of the major league club. The idea is coherent on paper, but Seattle will need to put in plenty of work to make it convincing.
Kanzler Brings Clear Development Focus to Seattle
Kanzler would replace Dan Wilson and become the 22nd manager in franchise history. He would also take the job without having managed at any level, a fact that may raise eyebrows. The Mariners are asking someone to learn the position while improving a team coming off a deeply disappointing season. This marks the third straight time Dipoto has asked someone to learn on the fly. Espada offered experience running a major league clubhouse, yet Seattle reportedly chose Kanzler anyway. The front office should be able to explain what separated him: how he evaluates players, how he communicates, and how he intends to handle a season when plans start falling apart.
Kanzler's background makes the offensive side particularly intriguing because Seattle has already acknowledged where part of the process broke down. Dipoto recently admitted that multiple homegrown Mariners said lessons from the minors had been abandoned in the majors—a poor handoff after years of development. A Kanzler-Gillman pairing gives Seattle a chance to repair that connection. The appeal is a plan that follows hitters through the organization and evolves as they face better pitching. Both men should understand what helped a player advance, reinforce what still works, and explain the adjustments needed. Reaching Seattle should mean building on that foundation, and the staff's job is to make sure it does.
Kanzler's Work with Jeremy Peña Offers a Blueprint
Kanzler's work with Jeremy Peña provides a concrete example. During Peña's rookie season in Houston, Kanzler worked with him as major league pitchers attacked his weaknesses. A September adjustment to quiet Peña's leg kick helped him get set earlier and make better swing decisions. Kanzler described improved contact, better results against sliders, and growing confidence at the plate. That is the kind of work needed in Seattle: identify what pitchers are exploiting, give the hitter an adjustment he understands, and help him carry it into games. Kanzler has been part of that process with a young major leaguer, and now he and Gillman would be responsible for making it work here. When a young Mariner struggles, there should be a visible purpose behind the response—whether that means everyday at-bats, a smaller role, or more work in the minors. Those decisions will reveal more than the introductory press conference.
Mariners Must Give Kanzler Authority and a Better Roster
Gillman's reported arrival gives Kanzler an intriguing partner, but it also raises an important question about how this staff came together. The public order of the announcements says little about Kanzler's involvement behind the scenes. A manager needs a meaningful voice in the people and decisions he will be held responsible for. Attention then shifts upstairs. Dipoto is entering his 12th season leading baseball operations, and Kanzler would be his third managerial hire. Another introduction must come with changes to the conditions surrounding the job: dependable offense, useful bench options, and enough depth to let a struggling young player work through problems without becoming the lineup's daily emergency. Kanzler can influence how the Mariners prepare and respond, but Dipoto and Justin Hollander still have to assemble a roster that gives those improvements somewhere to go.
The appeal is clear. With Kanzler and Gillman, Seattle is handing major responsibilities to the next generation of baseball leadership. These are young coaches getting the opportunity to put years of teaching and development work into practice at the highest level. They will have room to establish their own identity, and plenty to prove. The pairing gives Seattle's direction a recognizable shape. Now the front office has to give it substance. Kanzler and Gillman are getting their chance to help this team grow. The Mariners owe them a roster ready to win.
Tremayne Person is the Publisher for Mariners On SI and the Site Expert at Friars on Base, with additional bylines across FanSided's MLB division. He founded the Keep It Electric podcast in 2023 and covers baseball with a blend of analysis, context, and a little well-timed side-eye just to keep things honest. Follow TremaynePerson.