Vassell was born Aug. 23, 2000 and grew up in Suwanee, Georgia. He is the son of Cynthia and Andrew Cassell. His father, Andrew, played college ball at Stony Brook. Vassell has an older brother and an older sister. He began playing basketball at age six, playing on a 7-8-year-old team. The shooting guard attended Peachtree Ridge High School, where after his senior season he was named regional Player of the Year by the Gwinnett Daily Post. For college, Vassell attended Florida State and majored in Sport Management. With the Seminoles, he was voted Second-team All-ACC in 2020 after his sophomore season. He then declared himself eligible for the 2020 NBA Draft. Fans can follow the high scoring wing on Twitter @Yvngdevo and on Instagram @Devin_Vassell.