[1][2] Collier attended St. Anthony High School, was a four-star recruit and a consensus top 150 prospect rating 76th overall in ESPN.

[3] Collier played for the Oregon State Beavers men's basketball team, In his freshman season, he averaged 7 points, 4.4 rebounds and 0.7 assists per game.

[7] In 2014, he signed for the Puerto Rican side Caciques de Humacao where he averaged 8.7 points, 7.2 rebounds and 0.9 assists per game.

[10] In the 2016–17 season he moved to the Puerto Rican side Indios de Mayagüez where he averaged 12.9 points, 7.9 rebounds and 2 assists per game.

[13][14] He moved to the Capitanes de Arecibo in the 2018–19 season, where he averaged 6.4 points, 4.3 rebounds and 1.1 assists per game.