Zac Gallen Bio
Zachary Peter Gallen, known professionally as Zac Gallen, is an American professional baseball pitcher who is currently a free agent. Born on August 3, 1995, in Somerdale, New Jersey, Gallen has built a reputation as one of the most consistent starting pitchers in Major League Baseball (MLB), known for his strikeout ability and poise on the mound. Over the course of his career, he has played for the Miami Marlins and the Arizona Diamondbacks, with his longest tenure coming in Arizona, where he developed into a frontline starter and earned All-Star recognition in 2023.
A graduate of Bishop Eustace Preparatory School and the University of North Carolina, Gallen was selected by the St. Louis Cardinals in the third round of the 2016 MLB draft. He later became part of the package that sent Marcell Ozuna to St. Louis, moving through the Miami Marlins organization before settling in with the Diamondbacks midway through the 2019 season. With Arizona, he became the staff ace, set a franchise scoreless-innings record in 2022, and helped lead the team to the 2023 World Series.
Early Life and Background
Zachary Peter Gallen was born on August 3, 1995, in Somerdale, New Jersey, to Jim and Stacy Gallen. He grew up in a sports-oriented household in southern New Jersey, and baseball was part of his life from a very young age. When he was five years old, Gallen famously refused to play tee-ball with his peers, instead demanding to join Little League Baseball with the Somerdale team. He was taken in the third round of that Little League draft by his father’s team and went on to play alongside children who were two to four years older than him.
At the age of 11, Gallen joined the Tri-State Arsenal Baseball Academy in New Jersey, where he served as both a pitcher and a second baseman. The academy gave him early exposure to high-level coaching and helped shape his command on the mound. He attended Bishop Eustace Preparatory School in Pennsauken Township, New Jersey, where he continued to develop as a pitcher and drew attention from college scouts across the region.
Coming out of high school, Gallen was regarded as a polished right-handed prospect with a strong work ethic. His combination of competitiveness and polish made him an attractive recruit for top college programs, and he ultimately committed to the University of North Carolina to continue both his education and his baseball career.
Path to Professional Baseball
At the University of North Carolina, Gallen played college baseball for the North Carolina Tar Heels for three seasons, working his way into the weekend rotation and establishing himself as one of the ACC’s more reliable starters. During the summers following the 2014 and 2015 seasons, he played collegiate summer baseball with the Chatham Anglers of the Cape Cod Baseball League, a respected showcase league that has produced numerous big-league arms.
During his junior year in 2016, Gallen posted a 4–3 win–loss record with a 2.79 earned run average (ERA) and a .231 batting average against. That performance was enough to convince the St. Louis Cardinals, his childhood favorite team, to select him in the third round of the 2016 MLB draft. His path to the majors officially began with the Cardinals’ minor league system, but his big-league future would soon unfold elsewhere.
Zac Gallen Career
Early Career (2016–2018)
Gallen made his professional debut with the Gulf Coast Cardinals in 2016, posting a 1.86 ERA with 15 strikeouts across 9 and 2/3 innings pitched. He opened the 2017 season with the Palm Beach Cardinals before earning promotions to the Springfield Cardinals and eventually the Memphis Redbirds. Across all three levels in 2017, he finished with a combined 10–8 record, a 2.93 ERA, and a 1.17 WHIP in 26 starts, showing the kind of consistency that organizations look for in a future rotation piece.
On December 14, 2017, the Cardinals traded Gallen, along with Sandy Alcántara, Magneuris Sierra, and Daniel Castano, to the Miami Marlins in exchange for Marcell Ozuna. The deal would later be remembered as one of the most lopsided trades in recent memory. In 2018, as a non-roster invitee to spring training, Gallen spent the year with the New Orleans Baby Cakes, going 8–9 with a 3.65 ERA and a 1.47 WHIP across 25 starts, continuing his development at the Triple-A level.
Miami Marlins and Arizona Diamondbacks Debut (2019)
Gallen returned to New Orleans to begin the 2019 season, but his big-league opportunity arrived quickly. On June 20, 2019, the Marlins promoted him to the majors, and he made his debut that night against the Cardinals, the team that had originally drafted him. He recorded six strikeouts and gave up just one earned run over five innings, an impressive first impression against a familiar opponent.
His time in Miami was short. On July 31, 2019, the Marlins traded Gallen to the Arizona Diamondbacks for shortstop Jazz Chisholm Jr. In eight starts for Arizona down the stretch, Gallen went 2–3 with a 2.89 ERA across 43 and 2/3 innings, striking out 53 batters and showing the kind of swing-and-miss stuff that would soon make him a cornerstone of the Diamondbacks’ rotation.
Establishing Himself in Arizona (2020–2022)
Gallen returned to the Diamondbacks’ rotation in 2020 and continued to develop into a reliable starter. He recorded 82 strikeouts in 72 innings that shortened season, finishing with a 2.75 ERA and a 3–2 record. By 2022, he had fully blossomed into an ace. Beginning with a win over the Cleveland Guardians on August 2, he posted 34 and 1/3 consecutive scoreless innings and was named the National League Pitcher of the Month for August. The streak eventually reached 44 and 1/3 innings before ending in a September 11 win over the Colorado Rockies, breaking Brandon Webb’s 2007 franchise record of 42 scoreless innings and ranking as the seventh-longest streak in major league history. During the run, he produced six consecutive starts without allowing a run, tying a major league record, and also earned the NL Player of the Week Award for August 29 – September 4. For the 2022 season, Gallen went 12–4 with a 2.54 ERA and 192 strikeouts in 184 innings, finishing fifth in NL Cy Young voting.
All-Star Season and World Series Run (2023)
On January 13, 2023, Gallen agreed to a one-year, $5.6 million contract with the Diamondbacks, avoiding salary arbitration. He opened the year strong, earning NL Player of the Week honors for April 10–16, and was later named to the 2023 MLB All-Star Game, where he served as the starting pitcher for the National League. For the 2023 season, Gallen went 17–9 with a 3.47 ERA and 220 strikeouts across 210 innings, finishing third in NL Cy Young voting and earning All-MLB First Team honors.
Gallen also played a central role in Arizona’s postseason run. In Game 5 of the 2023 World Series, he pitched six no-hit innings against the Texas Rangers before being removed from the game. The Diamondbacks ultimately lost the series, but Gallen’s performance on baseball’s biggest stage further cemented his reputation as a pitcher capable of rising to the occasion.
Veteran Status and Free Agency (2024–2025)
On January 11, 2024, Gallen agreed to a one-year, $10 million contract with the Diamondbacks, avoiding arbitration for a second straight year. He was placed on the 15-day injured list on May 31 with a right hamstring strain, but returned on June 29 to throw six scoreless innings against the Oakland Athletics, allowing just one hit. It marked his fifth career start of six or more innings with one hit or fewer, and his second of the 2024 season. For the year, he went 14–6 with a 3.65 ERA and 156 strikeouts in 148 innings.
On January 9, 2025, Gallen agreed to a one-year, $13.5 million contract with the Diamondbacks, avoiding arbitration once again. Even after the addition of Corbin Burnes to the rotation, the Diamondbacks announced that Gallen would be their Opening Day starter for the third straight season. For the 2025 season, Gallen went 13–15 with a 4.83 ERA and 175 strikeouts in 192 innings, and he became a free agent following the campaign.
Notable Events and Milestones
Among the defining moments of Gallen’s career, his 44 and 1/3-inning scoreless streak in 2022 stands out as the signature achievement, breaking a franchise record that had stood since 2007 and ranking among the longest in major league history. His six no-hit innings in Game 5 of the 2023 World Series and his selection as the National League’s starting pitcher in that year’s All-Star Game further highlight his status as one of the most respected pitchers of his era.
Zac Gallen Family
Family Background and Personal Life
Zac Gallen was raised in Somerdale, New Jersey, by his parents, Jim and Stacy Gallen. His father, Jim, coached his Little League team when he was five years old, helping set the foundation for his lifelong love of the game. Gallen has credited his family with instilling the discipline and competitiveness that have defined his professional career.
Off the field, Gallen has kept much of his personal life private. He grew up as a devoted fan of the St. Louis Cardinals, the organization that would eventually draft him, and he continues to maintain ties to his southern New Jersey roots.
2025 Season Performance
The 2025 season marked Gallen’s seventh full year in the majors and his third consecutive Opening Day start for the Arizona Diamondbacks. Despite the offseason addition of Corbin Burnes to Arizona’s rotation, the organization showed its continued faith in Gallen by handing him the ball on Opening Day, signaling that he remained the staff’s emotional leader and go-to starter in big moments.
Statistically, 2025 was a more challenging campaign for Gallen. He finished the season with a 13–15 record, a 4.83 ERA, and 175 strikeouts across 192 innings pitched. The win-loss record reflected run support and bullpen support as much as his own performance, but his strikeout totals and innings-eater role confirmed his durability and continued value as a frontline starter.
Following the 2025 season, Gallen became a free agent, opening the next chapter of his career. At 30 years old, with an All-Star appearance, an All-MLB First Team selection, a franchise scoreless-innings record, and a World Series start on his résumé, he remains one of the more attractive starting pitchers available on the open market.