Adelman was born in Lynwood, California, the son of Gladys (née Olsen) and Leonard Joseph "L. J." Adelman, who were from North Dakota and worked as teachers and farmers.[3] Adelman began his basketball career in high school at Pius X High School in Downey, California, then matriculated to collegiate stardom at Loyola University of Los Angeles, now known as Loyola Marymount University.[4] In the 1968 NBA draft, he was selected by the San Diego Rockets (now the Houston Rockets) in the 7th round.[5] He played two seasons in San Diego before being taken by the expansion Trail Blazers in the 1970 expansion draft; he then played three seasons in Portland. He also played for the Chicago Bulls, New Orleans (now Utah) Jazz, and the Kansas City/Omaha (now Sacramento) Kings. He ended his playing career in 1975.
He was then hired by the Portland Trail Blazers (then coached by Jack Ramsay) as an assistant. When Ramsay was fired and replaced with Mike Schuler in 1986, Adelman was retained; when Schuler was in turn fired during the 1988–89 season, Adelman was promoted to interim coach. After leading the team into the playoffs that year (despite a 39–43 record), Adelman was given the coaching position on a full-time basis in the 1989 off-season.
The next three years were quite successful for Adelman and the Trail Blazers; the team went to the NBA Finals in 1990 and 1992 (losing to the Detroit Pistons and the Chicago Bulls respectively) and went to the Western Conference finals in 1991 (losing to the Los Angeles Lakers). Adelman spent two more years with the team, but was dismissed after the 1993–1994 season.
Golden State Warriors
On May 19, 1995, Adelman was hired as the head coach of the Golden State Warriors, which came off the heels of an injury-riddled 26-win season prior to his hiring.[6] He was unable to have a winning season in two years there, with his first season seeing the team win just ten of their last 28 games on their way to a 36–46 record. The following season saw them finish last in the division with 30 wins. On April 28, 1997, Adelman and his assistants were fired, with Adelman stating his feeling that it seemed inevitable by February.
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Sacramento Kings
After a year's absence from the sidelines, Adelman was hired by the Sacramento Kings in 1998. Under Adelman's guidance, the Kings were one of the most successful teams in the Western Conference, qualifying for the playoffs every year of his Sacramento career.
During the Kings' 2000 playoff run, they met Phil Jackson's Los Angeles Lakers. Adelman questioned Jackson's motivational techniques when it was learned that Jackson compared Adelman to Adolf Hitler.[8]
In 2002, the Kings made a serious run for the NBA Finals. After clinching the first seed in the competitive Western Conference, the Kings blazed through the opening two rounds but lost to the Lakers in a controversial series with noticeably lopsided officiating in favor of the Lakers.[9]
In 2006, Adelman (in the final year of his contract) led the Kings to the playoffs. Despite the team struggling early in the regular season, the Kings rebounded and qualified for the playoffs as the #8 seed. Although competitive, they were defeated 4–2 by the defending champion San Antonio Spurs. Adelman's contract with the Kings expired at the end of the 2005–2006 season. On May 9, it was reported by the Sacramento Bee that his contract would not be renewed. The Kings did not reach the playoffs again until 2023, nearly 17 years later.
Houston Rockets
The Houston Rockets brought in Adelman as their new head coach five days after the dismissal of Jeff Van Gundy on May 18, 2007. Van Gundy had taken the Rockets to three playoff appearances in four years with no series victories. In his first season as head coach, Adelman guided the Rockets to a 22-game winning streak from January through March 2008, the third-longest winning streak in NBA history. However, they lost in the first round in six games.
In the 2009 season, the Rockets finished fifth in the West with a 53–29 record. They entered the playoffs without their star shooting guard, Tracy McGrady, due to an injury. Despite this loss, the Rockets defeated the Portland Trail Blazers in six games to advance to the Western Conference Semifinals for the first time since 1997. Although they would lose the series to the Los Angeles Lakers, they also proved their resilience by taking the series to seven games despite the loss of star center Yao Ming in Game 3 of that series.
Adelman won his 800th career game, 13th among coaches in NBA history, on March 24, 2008, against the Sacramento Kings.[10]
On April 18, 2011, the Houston Chronicle reported that the Rockets would not give Adelman a new contract; Adelman and the team parted ways after four seasons and two playoff appearances.[11]
Minnesota Timberwolves
On September 13, 2011, the Minnesota Timberwolves confirmed the hiring of Adelman as their new coach.[12]
On April 6, 2013, Adelman won his 1,000th career game with a victory over the Detroit Pistons, becoming just the eighth coach in NBA history ever to do so.[13]
On April 21, 2014, Adelman announced his retirement from coaching in the NBA. It was also announced that he would stay with the Timberwolves as a consultant.[1] Adelman ranks ninth in terms of games coached and games won. He went 79–78 (.503) in playoff games and advanced to the NBA Finals twice, both times with the Portland Trail Blazers in 1990 and 1992 where they lost to the Detroit Pistons and Chicago Bulls.
The year after retirement in 2014, Adelman and his wife Mary Kay settled in Portland to be with their family, which includes six children and eleven grandchildren.