Basketball by the Washington State Coaches Association, and named the Gatorade Washington Player of the Year. He averaged 26.6 points, 8.0 rebounds, 4.6 assists, 4.4 steals and 1.6 blocks a game, while shooting 59.2% from the field and 76.5% from the free throw line. In his senior year, Harris led his team to fifth place in the Class 1A state tournament after leading them to a 26–2 record. He was named AP Class 1A Player of the Year and was selected to the Class 1A All-Tournament first team. In his junior year, he averaged 24.7 points, 8.5 rebounds, 4.3 assists and 2.7 steals a game, and led the Mountain Goats to the Class 1A state tournament with a 24–6 record. Harris played all four years for the Mountain Goats at Chelan High, where he was coached by his father, Joe. One of his goals was to take at least 1,000 shots a day.

As a child, Harris wrote personal goals and quotes from NBA legends on his bedroom walls and ceiling. He then volunteered to be the team manager from third to eighth grade. Harris started going to his father's basketball practices when he was just four years old. Kaiti played college basketball at Yakima Valley College and Warner Pacific College, Jaicee played volleyball at Washington State, and Mackenzie played volleyball at Chelan High. Harris has three sisters: his older sister, Kaiti, and his younger sisters, Jaicee and Mackenzie. Harris was born and raised in Chelan, Washington to Joseph 'Joe' Harris Sr., who coached the boys' basketball team at Bridgeport High for six years and then Chelan High for 25 years, and was inducted into the Washington Interscholastic Basketball Coaches Association Hall of Fame in 2011, and Alice Harris, who grew up playing softball, volleyball, and basketball, and is a broker and director of sales at Coldwell Banker Lake Chelan Properties. He currently has the fourth highest career three-point field goal percentage in NBA history. Harris is the all time three point field goals made scorer for the Nets surpassing Jason Kidd on 27th October, 2021.

Also in 2021, Harris surpassed Drazen Petrovic as the Nets' all-time leader in three-point field goal percentage.

The longest-tenured Net as of 2021, Harris led the NBA in three-point shooting accuracy in 2018–19 and repeated the feat in 2020–21. He was signed by the Nets in 2016, and is one of three players to make 200 three-pointers in one season in the history of the Nets franchise. He played college basketball for the Virginia Cavaliers, before being selected with the 33rd overall pick in the 2014 NBA draft by the Cleveland Cavaliers. Joseph Malcolm Harris (born September 6, 1991) is an American professional basketball player for the Brooklyn Nets of the National Basketball Association (NBA).

Gatorade Washington Player of the Year (2010).

NBA Three-Point Contest champion ( 2019).

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