Tenth overall pick of the Portland Trailblazers in the 2013 draft who played his college ball at Lehigh. He won the NBA's Most Improved Player award in 2016 after averaging over 20 points per game on the season.
He was the Gatorade Player of the Year in Ohio after finishing his senior season as the all time leading scorer at GlenOak high school.
At Lehigh, he was the first freshman in the Patriot League to be named conference player of the year. He was a member of the Lehigh team that made history by becoming only the 6th 15-seed to defeat a 2-seed in the NCAA Tournament when the team knocked off Duke 75-70.
He has a brother named Errick McCollum who also played basketball professionally.
In his first season with the Trailblazers, he was the backup shooting guard behind Wesley Matthews.