Obadiah Richard "Obi" Toppin was born Mar. 4, 1998 in Brooklyn, New York. He is the son of Roni and Obadiah Toppin. Tobin has one sibling named Jacob. He was 6-foot-2 as a high school junior and has since grown to 6-foot-9. As a senior at Ossining High School in Ossining, New York, he averaged 20.6 points, 8.1 rebounds, 3.0 assists and 3.0 steals. Toppin led that team to its first conference title in 10 years. For a postgraduate campaign, he enrolled at Mt. Zion Preparatory School in Baltimore, Maryland. Toppin then played college basketball at Dayton, where he studied media production. In 2020, as a redshirt sophomore, he was named National College Player of the Year and was a consensus First Team All-American. Fans can follow Toppin on Twitter @obitoppin1.