He spent two seasons with the Pacers while also playing for their NBA G League team, the Fort Wayne Mad Ants.

[6] Christmas committed to Syracuse basketball on August 6, 2010, after his junior season in high school.

[15] Christmas spent the majority of the 2015–16 season on assignment in the NBA Development League with the Fort Wayne Mad Ants.

[17] In the Pacers' 2015–16 regular season finale, Christmas made his NBA debut, scoring four points and making both his field-goal tries off the bench in a 97–92 win over the Milwaukee Bucks.

[18] He spent more time with the Pacers in 2016–17, appearing in 29 games, but still received multiple assignments to Fort Wayne.

When he was 13 years old he moved to Philadelphia, Pennsylvania to live with his aunt, Amira Hamid, who became his legal guardian.

[33] Christmas was initiated as an honorary member of the Alpha Epsilon Pi fraternity during his sophomore year at Syracuse University.

[34] Christmas is thought to be the first player in Syracuse men's basketball history to finish his undergraduate degree in 3 years.