Nicknamed "Q-Ball", he played professionally for 13 seasons for the Los Angeles Clippers, Phoenix Suns, New York Knicks, Miami Heat, and Orlando Magic.

Richardson played college basketball for DePaul University where he averaged 17.9 points and 10.2 rebounds per game in two seasons.

Richardson would star in a documentary with Miles entitled The Youngest Guns which chronicled their first three seasons in the NBA with the Clippers.

[1] In his first game as a starter on November 29, 2000, Richardson played 43 minutes and recorded 18 points, 8 rebounds, 1 assist and 1 steal in a 103 - 86 victory over the Golden State Warriors.

Richardson was traded from the Suns, along with 2005 draft pick Nate Robinson, to the New York Knicks in exchange for Kurt Thomas and Dijon Thompson on June 28, 2005.

[4] His first three seasons in New York were largely hampered by nagging injuries—the most serious being a chronic back condition—which limited him to 55, 49, and 65 games played respectively.

This does not include two additional DNP-CDs (Did Not Play – Coach's Decision) that he received; one on February 28, 2009, against the Miami Heat and a second on March 10, 2009, against the Milwaukee Bucks.

[6] His stint with the Grizzlies was very short as he was traded to the Los Angeles Clippers in exchange for Zach Randolph just 22 days later on July 17, 2009.

[7] His second stint with the Clippers only lasted for three days as on July 20, 2009, he was traded to the Minnesota Timberwolves for Sebastian Telfair, Mark Madsen, and Craig Smith.

He only played one regular season game, scoring five points in twenty nine minutes on 1 for 11 shooting, but brought down ten rebounds.

[15] In 1992, Richardson lost his mother to breast cancer, his grandmother to natural causes, and also his brother, Bernard, who was shot and killed in Chicago, aged 23.