Jarrett Matthew Jack (born October 28, 1983) is an American professional basketball player for the New York Knicks of the National Basketball Association (NBA). At 6'3" (1.91 m) tall and weighing 200 lbs (91 kg), he primarily plays point guard. Born in Fort Washington, Maryland, he attended four different high schools in North Carolina, Maryland and Massachusetts before playing collegiately at Georgia Tech. The Denver Nuggets drafted Jack in 2005.
High school career
The four different high schools he attended were DeMatha Catholic High School and St. Vincent Pallotti High School in Maryland, Mount Zion Academy in North Carolina and Worcester Academy in Massachusetts, where he played alongside Craig Smith.
After high school, Jack played for Georgia Tech in Atlanta.  In his sophomore year (2003–04), he helped guide Georgia Tech to the NCAA Finals with 12.5 points and 5.1 assists a game. In his junior and final year at Georgia Tech he averaged 15.5 points, 4.8 rebounds and 4.5 assists.
After forgoing his senior year of eligibility at Georgia Tech to enter the NBA draft, Jack graduated on December 13, 2014, receiving his degree in business management at commencement ceremonies in Atlanta. 
Portland Trail Blazers (2005–2008)
After his junior year at Georgia Tech, he opted to enter the 2005 NBA draft and was selected by the Denver Nuggets with the 22nd pick. On draft night, he was traded to the Portland Trail Blazers in exchange for their 27th pick ( Linas Kleiza) and 35th pick ( Ricky Sánchez).
As a rookie in 2005–06, Jack backed up Steve Blake and Sebastian Telfair at the point, getting limited minutes. Blake was traded to the Milwaukee Bucks and Telfair was traded to the Boston Celtics in a multi-player trade during the 2006 off-season. In their absence, Jack was named starting point guard by coach Nate McMillan for the 2006–07 season, dramatically increasing his minutes and stats. With Blake's return in 2007–08, however, Jack was once again relegated to sixth man.
Indiana Pacers (2008–2009)
Toronto Raptors (2009–2010)
New Orleans Hornets (2010–2012)
Golden State Warriors (2012–2013)
On July 11, 2012, Jack was traded to the Golden State Warriors in a three-team trade including the Philadelphia 76ers, who received Dorell Wright from Golden State. 
On February 22, 2013, Jack recorded a double-double with 30 points and 10 assists against the Spurs and became the first bench player to record such numbers since Magic Johnson in 1996. 
At the end of season, Jack finished third in the Sixth Man of the Year voting. 
Cleveland Cavaliers (2013–2014)
On July 12, 2013, Jack signed with the Cleveland Cavaliers.  On April 15, 2014, he was named the recipient of the ninth annual Austin Carr Good Guy Award. The award, named after Cavaliers legend Austin Carr, is designed to recognize a Cavaliers player who is cooperative and understanding of the media. 
Brooklyn Nets (2014–2016)
On July 10, 2014, Jack was traded to the Brooklyn Nets in a three-team trade involving the Cleveland Cavaliers and the Boston Celtics.  Hours after graduating from Georgia Tech on December 13, 2014, Jack travelled to Charlotte to join his teammates for their game against the Hornets. In 20 minutes of action off the bench, he recorded 14 points, 5 assists and 2 rebounds to help the Nets win 114–87. 
On November 14, 2015, Jack scored a season-high 28 points in an overtime loss to the Golden State Warriors.  On January 3, 2016, he was ruled out for the rest of the season with a torn anterior cruciate ligament and small medial meniscus tear in his right knee. He sustained the injury the previous night during the second half of the Nets' game at Boston.  On June 30, 2016, Jack was waived by the Nets. 
On July 15, 2016, Jack signed with the Atlanta Hawks.  However, on October 20, 2016, he was waived by the Hawks due to injury. He had been unable to practice during training camp due to torn right knee ligaments he suffered in 2015–16, and subsequently sat out all seven of the Hawks' exhibition games during the preseason.  
Return to New Orleans (2017)
On February 24, 2017, Jack signed a 10-day contract with the New Orleans Pelicans, returning to the franchise for a second stint.  However, on March 3, 2017, he was ruled out for four to six weeks after suffering a right lateral meniscus tear. 
New York Knicks (2017–present)
NBA career statistics
|GP||Games played||GS||Games started||MPG||Minutes per game|
|FG%||Field goal percentage||3P%||3-point field goal percentage||FT%||Free throw percentage|
|RPG||Rebounds per game||APG||Assists per game||SPG||Steals per game|
|BPG||Blocks per game||PPG||Points per game||Bold||Career high|
On the morning of February 20, 2011, Jack was arrested for DUI in a suburb of Atlanta, while returning from an All-Star weekend party. He was going 66 in a 45 MPH zone and weaving uncontrollably. He failed a field sobriety test, and when taken to the police station, he registered under the legal limit of 0.08 on the breathalyzer, thus passing. He was still charged with DUI and failure to maintain lane, and was released later that night.