Quinn Krippendorff Sullivan (born March 27, 2004) is an American professional soccer player who plays as an attacking midfielder or winger for Major League Soccer club Philadelphia Union.^[3]

Sullivan, who is a dual citizen, began his youth career at Fishtown A.C. and then transferred to the Philadelphia Union academy where he attended the prestigious YSC Academy School. He made his professional debut at the age of 16 years old with the club's reserve team, Philadelphia Union II, on July 18, 2020 against the Pittsburgh Riverhounds. He came on as a substitute in the second half.^[4]

Sullivan officially signed for the first team on November 12, 2020 as a homegrown player alongside childhood teammate Brandan Craig. Sullivan's contract began as a rostered player for the 2021 season.^[5][6] His first minutes for the Union were late-game substitutions during the Union's first CONCACAF Champions League campaign.^[7] Sullivan made his first league start for the Union on June 26 against Chicago Fire, where he scored his first goal to equalize the match at 1–1.^[7] His first professional goal for the Union earned Goal of the Week honors, and he subsequently added another GOTW.^[8]

Sullivan has represented the United States under-20 team in nineteen (19) occasions.

Overall he has scored 10 goals in those appearances and added five assists. In the lead up to the CONCACAF Championship he scored a hat trick as a substitute in a come from behind win over River Plate’s reserve team and added another goal in a 2-2 tie versus the Argentina U20’s.

In CONCACAF U20 group play Quinn scored a hat trick in a 3-0 win against Cuba to finish top of the group. He also scored a brace (2 goals) against Nicaragua in the quarterfinals and another goal against the host team, Honduras, in the semifinal. He has tallied three assists and a drawn pk in tournament play as well.

Sullivan comes from a soccer family: his father, Brendan, played for five clubs over a six-year professional career in the A-League. Prior to that, Brendan Sullivan was an All-Ivy selection at University of Pennsylvania and starred at St. Joseph's Prep in Philadelphia. He then went on to coach at his alma mater. Quinn's mother, Heike, played Division I soccer and captained the University of Pennsylvania women’s team.^[9][10] Quinn's younger brother Cavan is a U.S. youth international who plays in the Philadelphia Union youth system.^[11] His two other brothers, the younger twins Declan and Ronan, are also youth soccer players, with both currently attending YSC Academy and playing for MLS NEXT affiliate FC DELCO.^[12]

His cousin is Chris Albright, an American international who played two seasons for the Union, and his grandfather is Larry Sullivan, who served as the head coach at Villanova from 1991 to 2007.^[9][13] Quinn's uncle, Bryan Sullivan, was a Division I goalkeeper at Philadelphia Textile and was also on the coaching staff at Villanova.^[14]

His maternal grandmother is Bangladeshi and his maternal grandfather is Klaus Krippendorff.^[15]

Philadelphia Union

• MLS Cup runner-up: 2022^[17]

United States U20

• CONCACAF U-20 Championship: 2022

Individual

• CONCACAF U-20 Championship Best XI: 2022