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|Full name||Jeffrey Cassar|
|Date of birth||February 2, 1974|
|Place of birth||Livonia, Michigan, United States|
|Height||6 ft 2 in (1.88 m)|
|1992–1995||FIU Golden Panthers|
|2002||→ MetroStars (loan)||0||(0)|
|2003||→ Charlotte Eagles (loan)||1||(0)|
|2007||FC Dallas (assistant)|
|2007–2013||Real Salt Lake (assistant)|
|2014–2017||Real Salt Lake|
|* Senior club appearances and goals counted for the domestic league only.
Cassar played college soccer at Florida International University, where he was roommates with Steve Ralston.Following his graduation, he was selected eighth overall in the 1996 MLS College Draft by the Dallas Burn. Although Cassar made the team, Mark Dodd took firm hold of the starting position, and Cassar only appeared in two games that season. After spending all of the 1997 season injured with a torn ACL, Cassar was selected tenth overall in the 1997 MLS Expansion Draft by the Miami Fusion. Cassar started much of the Fusion's inaugural season, appearing in twenty-one games, all starts, and compiling a GAA of 1.95. After splitting starting duties with Garth Lagerway in 1999, Cassar lost his job to Nick Rimando, and would start just ten games for Miami in 2000 and 2001. Upon Miami's contraction at the end of the 2001 season, Cassar was again selected by the Burn in the 2002 MLS Dispersal Draft, but failing to make the team, went looking for work overseas. Cassar found a job as the backup for Bolton Wanderers in England, and would remain with the team from March to June 2002.
Cassar returned to the United States at the end of the English season, and signed with the Atlanta Silverbacks of the A-League, for whom he appeared in six games. Cassar joined Dallas for a third time the next year, signing on as a backup for D.J. Countess following Matt Jordan's departure for Europe. Cassar appeared in seven games for the Burn in 2003, doing a passable, if unexceptional, job for the team. Following the 2003 season, the Burn brought in a new coach, Colin Clarke, who traded away Countess and replaced him with Scott Garlick. Although Garlick began the season as the team's starting goalkeeper, an injury midseason gave Cassar the opportunity to seize the position, which he did with a series of impressive performances; he ended the season as the club's starting goalkeeper, having made nineteen starts.
Following the 2006 season, Cassar retired and was appointed by new head coach Steve Morrow, Clarke's replacement, as the team's goalkeeper coach. In May 2007, he became the goalkeeper coach for Real Salt Lake. However, he also spent time at the end of the season as an assistant with the Puerto Rico Islanders of the USL First Division.
Jeff was called on as a goalkeeper coach for the US Men's National Team in September 2013 during their world cup qualification bid against Mexico.
After serving as the head coach of Real Salt Lake for three full seasons in Major League Soccer, Cassar was dismissed on March 20, 2017, following an 0-2-1 start to the 2017 MLS season. Cassar's assistant coach Daryl Shore was appointed interim head coach on the same day.
- ESPNFC.com. "Real Salt Lake fires coach Jeff Cassar three games into season; ESPNFC". ESPNFC.com. Retrieved March 20, 2017.
-  Archived January 8, 2008, at the Wayback Machine.
- http://www.sltrib.com. "Real Salt Lake’s Alvaro Saborio will miss World Cup qualifier with new calf injury | The Salt Lake Tribune". Sltrib.com. Retrieved December 18, 2013.
- http://www.deseretnews.com. "Real Salt Lake fires Jeff Cassar, Daryl Shore to serve as interim head coach; Deseret News". Deseretnews.com. Retrieved March 25, 2017.