Brandon Eisert Bio
Brandon Michael Eisert is an American professional baseball pitcher who currently plays for the Chicago White Sox of Major League Baseball (MLB). A left-handed reliever, he previously played in MLB for the Toronto Blue Jays, the organization that originally drafted him. He made his Major League debut in 2024 after several seasons working his way through the Blue Jays’ farm system.
Since reaching the majors, Eisert has continued to develop as a relief pitcher, contributing out of the bullpen at the highest level. His career path from college standout to MLB pitcher reflects steady progression through every level of professional baseball.
Early Life and Background
Brandon Michael Eisert was born on January 19, 1998. He grew up in the Portland, Oregon area and attended Aloha High School, where he developed as a young baseball player. The Pacific Northwest provided him with a strong amateur baseball environment that helped prepare him for the next step in his career.
During his high school summers, Eisert played collegiate wood bat baseball with the Cowlitz Black Bears of the West Coast League, a well-regarded summer circuit for college-level players. That experience allowed him to face older competition and refine his skills before enrolling at Oregon State University.
At Oregon State from 2017 to 2019, Eisert became a key member of one of the most successful college baseball programs in the country. He was a contributor on Oregon State’s 2018 National Championship team, a milestone that gave him significant exposure heading into the professional draft.
Path to Baseball
Following his junior season at Oregon State, Eisert was selected by the Toronto Blue Jays in the 18th round, with the 537th overall pick, of the 2019 Major League Baseball draft. Being drafted, even in a later round, validated his college development and gave him a clear professional opportunity.
The 2020 minor league season was cancelled because of the COVID-19 pandemic, meaning Eisert did not appear in an official game that year. The pause delayed his professional debut but also allowed him additional time to prepare physically and mentally for his first full professional season.
In 2021, Eisert made his professional debut and was assigned to the Blue Jays’ minor league affiliates. He began the long climb through the system that would eventually carry him to the major leagues.
Brandon Eisert Career
Early Career (2021-2023)
Eisert made his professional debut in 2021, splitting the year across three affiliates: the Single-A Dunedin Blue Jays, the High-A Vancouver Canadians, and the Double-A New Hampshire Fisher Cats. Working primarily as a reliever, he appeared in 32 games and produced a 6-1 record with a 3.55 earned run average, striking out 82 batters across 63 and one-third innings. The strong showing across multiple levels signaled that he was ready for a tougher assignment.
In 2022, Eisert advanced to Triple-A Buffalo, where he spent the entire season with the Bisons. He made 45 appearances, posted a 3.41 ERA, and recorded 77 strikeouts across 60 and two-thirds innings. He returned to Buffalo in 2023 and posted a 4-3 record with a 4.17 ERA, 76 strikeouts, and two saves in 59 games, continuing to handle a late-inning relief role.
Toronto Blue Jays Debut (2024)
Eisert began the 2024 season back at Triple-A Buffalo, where he struggled to a 6.35 ERA across 19 outings. Despite that setback, the Blue Jays saw enough in his arsenal to give him an opportunity at the major league level.
On June 17, 2024, Eisert was selected to the 40-man roster and promoted to the majors for the first time. In three appearances during his rookie campaign, he posted a 4.05 ERA with two strikeouts across six and two-thirds innings, getting his first taste of big-league hitters.
Following the 2024 season, Eisert was designated for assignment by Toronto after the team signed free agent Anthony Santander on January 20, 2025, ending his time in the Blue Jays organization.
Chicago White Sox Era (2025-Present)
After being designated by Toronto, Eisert was traded to the Tampa Bay Rays in exchange for cash considerations on January 23, 2025. He was designated for assignment by the Rays just over a week later on February 3, and then claimed off waivers by the Chicago White Sox on February 7, quickly finding a new home.
On April 20, 2025, Eisert recorded his first career Major League win after tossing one and two-thirds innings against the Boston Red Sox, a milestone that validated his perseverance through three organizations in a single offseason. He spent the bulk of the season contributing out of the White Sox bullpen and continued to build his resume as a reliable left-handed reliever.
To begin 2026, Eisert was optioned to the Triple-A Charlotte Knights, giving the White Sox flexibility to manage his workload early in the year while keeping him ready for a return to Chicago.
Driving Style and Strengths
Eisert works primarily as a left-handed relief pitcher and has spent the majority of his professional career in bullpen roles. His ability to miss bats, highlighted by his strikeout totals at every minor league stop, suggests he profiles as a swing-and-miss arm who can miss bats against both right-handed and left-handed hitters.
Notable Events and Milestones
Key milestones for Eisert include his selection to Oregon State’s 2018 National Championship team, his 2021 professional debut across three affiliates, his MLB debut with the Blue Jays on June 17, 2024, and his first career MLB win on April 20, 2025, against the Boston Red Sox as a member of the White Sox.
Brandon Eisert Career Wins
Brandon Michael Eisert has collected wins at every level of professional baseball, beginning in the Blue Jays’ minor league system and continuing in the major leagues. His first MLB victory came during the 2025 season with the Chicago White Sox.
Minor League and MLB Highlights
In the minors, Eisert posted a 6-1 record during his 2021 debut season across three affiliates, and later spent two full years at Triple-A Buffalo in 2022 and 2023. His first major league win arrived on April 20, 2025, when he delivered one and two-thirds strong innings against the Boston Red Sox to earn the decision.
Brandon Eisert Family
Family Background and Racing Lineage
Public details about Brandon Michael Eisert’s family background are limited. He grew up in the Portland, Oregon area, where he attended Aloha High School and developed his pitching craft.
Personal Life
Eisert has kept his personal life largely private, and no public details about a spouse or children are available in verified sources.
2025 Season Performance
The 2025 season represented a whirlwind chapter in Brandon Michael Eisert’s career, as he changed organizations three times in less than a month before landing with the Chicago White Sox. After being designated by Toronto, traded to Tampa Bay, and then claimed by Chicago, he settled into a bullpen role and quickly produced results.
His first career MLB win on April 20 against the Boston Red Sox marked the early highlight of his White Sox tenure. He spent the rest of the season working out of the Chicago bullpen, gaining valuable major league experience against American League competition.
Heading into 2026, Eisert was optioned to Triple-A Charlotte to begin the year, a common move that gave the White Sox roster flexibility while keeping him on a short leash for a return to Chicago.
