Short answers, pulled from the story.
Dan Issel accumulated over 27,000 points across his combined ABA and NBA career. At the time of his retirement in 1985, only Kareem Abdul-Jabbar, Wilt Chamberlain, and Julius Erving had scored more professional basketball points. He currently ranks eleventh on the all-time combined ABA/NBA scoring list.
Dan Issel scored 2,538 points in the 1971-72 ABA season, a record that still stands as the most points scored in a single ABA season. He also led the ABA in total points three times during his career and posted a scoring average of 30.6 points per game that season.
Dan Issel scored 2,138 points at the University of Kentucky from 1966 to 1970, averaging 25.7 points per game, and his career total remains the highest in University of Kentucky men's basketball history. He scored 53 points against Ole Miss on the 7th of February 1970, breaking the previous single-game record of 51 held by Cliff Hagan. He also set 23 school records during his career.
In 1994, Dan Issel coached the Denver Nuggets to defeat the Seattle SuperSonics as an eighth seed defeating a first seed in the first round, the first time in NBA history that an eighth seed had beaten a first seed in the opening round of the playoffs. The Nuggets won in five games.
Dan Issel was inducted into the Naismith Memorial Basketball Hall of Fame in 1993. His jersey number 44 was also retired by the Denver Nuggets in 1985, the year he retired from playing.
On the 11th of December 2001, after a loss to the Charlotte Hornets, Issel directed a racial slur at a fan outside the Pepsi Center; the incident was captured by Denver's NBC affiliate, KUSA-TV. The Hispanic Chamber of Commerce called for his firing, and the team suspended him without pay for four games. After accepting a buyout of his contract, Issel resigned on the 26th of December 2001.