Del Harris joined the Dallas Mavericks as an assistant coach prior to the 2000-2001 season.
His first success as a basketball coach came via a nine-year stint with Earlham (Indiana) College where he led the school to three conference championships.
Harris began his career in the NBA in 1976 as an assistant coach with the Houston Rockets. After three seasons, he was named the Rockets' head coach. He piloted the Rockets for four seasons which included four playoff appearances and an appearance in the NBA Finals.
Joining Don Nelson's staff in Milwaukee in 1983, he began an association that would endure over two decades. He worked under Nelson for four seasons before taking over the team in 1987. He coached the Bucks for four-plus seasons before being released 17 games into the 1991-1992 campaign.
The Los Angeles Lakers came calling in 1994 and Harris was named head coach during the summer of that year. Along with Pat Riley and Phil Jackson, he is the only coach in franchise history to register three consecutive 50+ win seasons and was named the NBA's Coach of the Year in '94-'95. Let go after 12 games in the 1998-1999 season, it proved to be Harris' final head coaching position in the NBA where he left with a mark of 556-457 (.549).
Again, he joined his friend Don Nelson, this time with the Mavericks where he began a seven-year run as an assistant coach under Nelson and Avery Johnson. He had a brief stint, beginning in 2008, as an assistant with the Chicago Bulls before returning to the Dallas area where, today, he is head coach of the Texas Legends of the NBA Development League.