Following graduation, Curtin became the first Wildcat to be drafted by the MLS when he was selected by the Chicago Fire. Perceptions that Curtin was not athletic enough to play professionally, and the relative obscurity of Villanova, led to Curtin not being drafted until the third round of the 2001 MLS SuperDraft. Curtin made his professional debut against D.C. United at Soldier Field during the second week of the 2001 MLS season. Curtin was named to the starting line-up after starting tandem Diego Gutierrez and Andrew Lewis received straight red cards in the opening match against Columbus Crew. In the same season, the Fire sent Curtin on loan to the Milwaukee Rampage in three early-season games and for the USL A-League playoffs. His rookie year saw 12 starts and registering 1,194 minutes. From his second season onward, Curtin would anchor a starting spot in the Fire's centerback tandem, started 22 games and played 2,121 minutes. Curtin started every game for the Fire in 2003, playing alongside Carlos Bocanegra and helped the team's defense compensate for Bocanegra's loss in 2004. He would go on to play in more than 200 games for the Fire, which included U.S. Open Cup championships in 2003 and 2006. He was also named 2004 MLS All-Star and the March of Dimes/Comcast Athlete of the Year in 2005. In 2014, while serving as head coach of the Philadelphia Union, Curtin was ceremonially retired as a Chicago Fire player.
On February 7, 2008, one day after his newborn daughter Ryan was born he was traded to Chivas USA for a conditional pick in the 2010 MLS SuperDraft. After two seasons in southern California, Curtin was waived by Chivas USA on January 26, 2010.
Coaching career
Philadelphia Union
After departing Chivas, Curtin returned to the Philadelphia region and began working with the newly formed Philadelphia Union as a coach in the academy system in June 2010. In November 2012, Curtin was named assistant coach for his hometown Philadelphia Union, under John Hackworth and alongside Brendan Burke and Rob Vartughian. During the 2014 season, Hackworth was fired after a run of poor results with Curtin being named interim manager during the team's search for a permanent replacement. The Union would see a turnaround of form under Curtin, losing only 5 of the remaining 16 matches in the season and advanced to the U.S. Open Cup final, ultimately finishing runners-up to Seattle Sounders in extra time. Such success would be rewarded on November 7, 2014, the Philadelphia Union announced that Curtin would take the reins as the head coach; removing the "interim" title he had held previously. The 2015 season would still see the Union struggle during the regular season but made a second consecutive appearance in the U.S. Open Cup final, losing this one to penalty kicks at home to Sporting Kansas City. Near the end of the 2015 season, the Union would fire Nick Sakiewicz as CEO and appoint Earnie Stewart as "Sporting Director" to work with Curtin and address the team's struggles. Initial improvements saw the Union returning to the post-season in 2016for the first time since the 2011 season. During this season, with a win over rivals New York City FC on April 23, 2016, Curtin set a record five consecutive home wins as well as becoming the highest wins coach in Union history. The Union would be unable to build on their 2016 success, finishing with the same record but still missing the playoffs in 2017. Curtin was announced to retain his head coach position for the 2018 season. Ahead of the 2019 season, Union Sporting Director, Ernst Tanner, announced that Curtin would be retained for the upcoming season on a one-year extension. By July of that season, the Union reach first place in the Eastern Conference and hitting the club's best start to a season. This success lead to the club announcing Curtin signed a two-year contract extension, to remain head coach through the 2021 season.
Managerial statistics
All competitive league games and international matches are included.
