Toppin attended Ossining High School where he played basketball, football and volleyball.

Toppin was not highly recruited but committed to play college basketball at Rhode Island.

[2] Toppin averaged 5.1 points and 3.9 rebounds in bench role as a freshman at Rhode Island.

Toppin declared for the 2023 NBA draft following the season, forgoing an additional year of eligibility.

[8] On December 5, 2023, Toppin made his NBA debut for the Knicks in a 146–122 loss to the Milwaukee Bucks.