Geoff Hartlieb

Geoffrey Thomas Hartlieb (born December 9, 1993) is an American professional baseball pitcher in the Colorado Rockies organization. He has previously played in Major League Baseball (MLB) for the Pittsburgh Pirates, New York Mets, and Miami Marlins.

Amateur career
Hartlieb attended Highland High School in Highland, Illinois. Hartlieb was all-state in basketball his junior and senior years of high school, and originally quit baseball at the end high school. He attended Quincy University in Quincy, Illinois his freshman year of college in 2013 and played college basketball for the Hawks. He then transferred to Lindenwood University in Saint Charles, Missouri to play college baseball from 2014 through 2016. He was drafted by the New York Mets in the 37th round of the 2015 MLB draft, but did not sign and returned to Lindenwood.

Pittsburgh Pirates
The Pittsburgh Pirates selected Hartlieb in the 29th round of the 2016 Major League Baseball draft and signed. He signed with the Pirates spent his first professional season with the Bristol Pirates in 2016, going 4–1 with a 4.44 earned run average (ERA) in 26 innings pitched. He spent the 2017 season with the West Virginia Power and the Bradenton Marauders, combining to go 2–6 with a 2.12 ERA in $63 2/3$ innings. In 2018, he played for the Altoona Curve, going 8–2 with a 3.24 ERA in 58 innings. During the 2018 offseason, he played for the Surprise Saguaros of the Arizona Fall League. Hartlieb opened the 2019 season with the Triple-A Indianapolis Indians.

The Pirates promoted Hartlieb to the major leagues for the first time on May 17, 2019. He made his major-league debut on May 18 versus the San Diego Padres. In 2020 for Pittsburgh, Hartlieb pitched to a 3.63 ERA, allowing only one home run in $22 1/3$ innings pitched. In 2021, Hartlieb split the between Indianapolis and Pittsburgh, but struggled to a 7.71 ERA in four major-league appearances before he was designated for assignment on July 3, 2021.

New York Mets
On July 9, 2021, Hartlieb was claimed off waivers by the New York Mets and was assigned to the Triple-A Syracuse Mets. Hartlieb made seven appearances for the Mets in 2021, struggling to an 11.00 ERA with nine strikeouts. On September 2, Hartlieb was designated for assignment by the Mets.

Boston Red Sox
On September 4, 2021, Hartlieb was claimed off of waivers by the Boston Red Sox, and was optioned to the Triple-A Worcester Red Sox. On September 23, Hartlieb was designated for assignment by the Red Sox. He cleared waivers and was sent outright to Worcester on September 26.

Hartlieb spent the entirety of the 2022 season with Triple–A Worcester. In 40 appearances, he registered a 3–6 record and 5.16 ERA with 64 strikeouts in 61.0 innings of work. He elected free agency following the season on November 10, 2022.

Miami Marlins
On November 29, 2022, Hartlieb signed a minor league deal with the Miami Marlins. In 26 games for the Triple–A Jacksonville Jumbo Shrimp, he posted a 3.18 ERA with 36 strikeouts and 6 saves in 34.0 innings of work. On August 6, 2023, the Marlins selected Hartlieb's contract, adding him to the major league roster. He made his Miami debut that day, tossing an inning against the Texas Rangers and allowing one run while striking out two. Hartlieb would make only one more appearance for the Marlins before he was designated for assignment on September 6. He cleared waivers and was sent outright to Triple–A Jacksonville on September 8. On October 5, Hartlieb elected free agency.

Colorado Rockies
On November 13, 2023, Hartlieb signed a minor league contract with the Colorado Rockies. In 22 games for the Triple–A Albuquerque Isotopes, he logged a 5.61 ERA with 34 strikeouts across $33 2⁄3$ inning pitched. On June 8, 2024, the Rockies selected Hartlieb's contract, adding him to their active roster. In five games for Colorado, he struggled to a 9.00 ERA with seven strikeouts across nine innings pitched. Hartlieb was designated for assignment following the promotion of Austin Kitchen on June 22. He cleared waivers and was sent outright to Albuquerque on June 25.