Collison, played his college basketball at UCLA where he was a three-year starter at point guard.
After serving as a backup his freshman season, Collison started in 2006-2007 and earned All PAC-10 first team honors. As a junior, he was All PAC-10 second team.
It all came together for the 6'0 guard his senior year as he was again All PAC-10 first team and an Associated Press Honorable Mention All-American. Averaging 14.4 points and 4.7 assists he also led the conference in free throw percentage and was third in both assists and steals.
One of the highest rated point guards coming out that year, Collison was drafted in the first round of the 2009 NBA draft by the New Orleans Hornets. Seeing ample playing time due to injuries to starter Chris Paul, he saw action in 76 games, averaging 12.4 poin ts and 5.7assists in 27.8 minutes. Those numbers helped earn him a sot on the NBA All-Rookie team.
Nevertheless, Collison was traded during the offseason, as part of a four-team trade, to the Indiana Pacers. In 2010-2011, Collison played in 79 games for Indiana, averaging 13.2 points and 5.1 assists in 29.9 minutes and led the Pacers to the NBA playoffs.
The next season Collison's numbers slipped slightly as he was on the court for only 60 games but still managed to help Indiana to the second round of the NBA playoffs.
Dallas acquired Collison and Dahntay Jones during the summer of 2012 in a trade with the Pacers. In his first season with the Mavs' he saw action in both the role of a starter and coming of the bench.
Following the season, Collison signed a two-year deal (with a player option the second year) with the Los Angeles Clippers to backup All-Star point guard Chris Paul.