James Thomas "JT" Marcinkowski is an American professional soccer player who plays as a goalkeeper for Major League Soccer club LA Galaxy.
Career College and Amateur Marcinkowski played for the Georgetown Hoyas for three seasons, from 2015 to 2017, where he achieved a 0.84 goals against average (GAA) over 56 appearances. In his final season at Georgetown, he captained the team to a 2017 Big East Conference Men's Soccer Tournament championship win, his second with the team. He also played two games for the USL PDL side Burlingame Dragons.
Professional Marcinkowski signed a Homegrown Player contract with the MLS side San Jose Earthquakes on December 6, 2017, after spending four years prior to his college career with the team's academy. He was San Jose's third ever Homegrown signing to the first team, after Tommy Thompson and Nick Lima. Marcinkowski was then temporarily loaned to San Jose's USL affiliate Reno 1868 FC, and played his first game for the team in Reno's 3–4 loss to Swope Park Rangers on March 17, 2018.
International Marcinkowski has played for the United States' men's national team at multiple levels, earning 24 caps between the U14 and U18 levels. In 2017, he played for the U20 squad, at the 2017 CONCACAF U-20 Championship and the 2017 FIFA U-20 World Cup. Marcinkowski was named to the final 20-player United States under-23 roster for the 2020 CONCACAF Men's Olympic Qualifying Championship in March 2021.
