
The Colorado Rockies announced on Monday afternoon that they have hired Ethan Katz as their new pitching coach for the 2027 Major League Baseball season.
Katz, 43, was originally selected by the Rockies organization in the 26th round of the 2005 draft. A right-handed pitcher, he spent four seasons in the Rockies’ farm system from 2005 through 2008. During that time he posted a 2.79 combined ERA over 102 appearances—mostly out of the bullpen—and 177.1 innings.
He also played independent baseball in 2009.
His coaching career began at Harvard-Westlake High School in California, a school with prestigious baseball history. Katz was the pitching coach from 2009 to 2013 and coached multiple future MLB players, including pitchers Max Fried, Lucas Giolito, and Jack Flaherty.
Katz made the jump to coaching professional baseball starting in 2013, where he coached in the minor league system for the Los Angeles Angels and Seattle Mariners. He also served as the assistant minor league pitching coach for the San Francisco Giants in 2019.
The Giants promoted Katz to serve as their assistant pitching coach for the COVID-19 shortened 2020 season. That year the Giants held a team ERA of 4.64 with 488 strikeouts, 210 walks, and had opposing hitters slash .241/.322/.410 against them.
Katz was then hired by the Chicago White Sox as their MLB pitching coach starting in 2021. He served in that role through the 2025 season until being fired after three consecutive 100-loss seasons—including the year the White Sox set the modern era record for most losses in a single season in 2024.
In Katz’s first season with the White Sox, their pitching staff was one of the best units in baseball with a team ERA of 3.73—fifth best in the league. Their rotation was anchored by multiple American League Cy Young Award candidates including Carlos Rodón, Lance Lynn, Dylan Cease, and Lucas Giolito. Meanwhile, their bullpen featured the likes of Garrett Crochet, Laim Hendriks, and Michael Kopech.
Unfortunately, the White Sox saw diminishing returns over the next few seasons. Their 3.92 ERA in 2022 placed them in the middle of the pack, and in 2023 and 2024 their team ERA ballooned to 4.87 and 4.67 respectively. They rebounded somewhat in 2025 with a 4.26 ERA, but manager Will Venable and the White Sox front office decided to go in a different direction with their rebuilding club.
Katz was hired by the Houston Astros to serve as their assistant pitching coach in 2026. The Astros had a difficult season, winning their division without a winning record and getting eliminated quickly in the post-season. The pitching staff held a team ERA of 4.45, a far cry from the staff that had been a top ten unit in baseball over the last few seasons.
The Astros terminated Katz alongside manager Joe Espada at the end of the season amidst rumors that Katz had been denied the opportunity to interview for a promotion with another team before being fired.
Katz will take over as the Rockies’ big league pitching coach under pitching director Matt Daniels following the firing of Alon Leichman earlier this off-season. Leichman was ousted after one season where the Rockies pitching staff held a league-worst 5.99 ERA.
Of the hire, Rockies manager Warren Schaeffer said via text message, “We are very excited to add Ethan to our staff. We love the experience he brings in this role as well as his track record of getting pitchers better on a consistent basis. He is a tireless worker, and players rave about him across the league. Can’t wait to start working with him!”
This story has been updated to include a comment from Rockies manager Warren Schaeffer.
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