Cassius Jerome Stanley was born on August 18, 1999, in Los Angeles, California, into a world where professional sports wasn't an aspiration — it was the family business. His father, Jerome Stanley, was a sports agent for three decades, the first Black agent to represent the No. 1 overall pick in the NFL Draft. His client list read like a hall of fame: Baron Davis, Keyshawn Johnson, Chad Johnson, Brian Shaw. His mother, Tonya Sedwick, was a heptathlete at UCLA. Cassius grew up around stars the way other kids grow up around neighbors.
The stories from his childhood sound invented. He trained with Paul George during middle school summers. He once found himself doing baseball drills at USC next to Tom Brady. He attended Sierra Canyon School in Chatsworth — the celebrity prep school in the San Fernando Valley where the children of Scottie Pippen, Kenyon Martin, and Diddy all enrolled. Before he ever played a high school varsity game, he had a USC scholarship offer. Before he finished his sophomore year, his dunk mixtapes had gone viral on YouTube.
Stanley started at Harvard-Westlake School in Studio City, where he averaged 17.9 points, 6.8 rebounds, and 3.5 assists as a sophomore. He transferred to Sierra Canyon for his junior and senior seasons, joining a program that was becoming the most star-studded high school team in America. His teammates included Scotty Pippen Jr. and Kenyon Martin Jr. — both future professionals themselves. As a senior in 2018-19, Stanley averaged 17.8 points, 6.2 rebounds, and 2.9 assists, leading Sierra Canyon to a 32-3 record and its second consecutive CIF State Open Division championship. He scored 20 points with seven rebounds in the title game. He was named California's MaxPreps State MVP, CIF Open Division Player of the Year, and Los Angeles Daily News Player of the Year.
His recruitment was a late-breaking Hollywood plot twist. For most of his senior year, Stanley's final three schools were Kansas, Oregon, and UCLA — all in the Pac-12 or close to home. Then UCLA fired Steve Alford in late 2018, and the coaching vacancy opened a door. Duke swooped in with a late offer. Stanley visited Durham in April 2019 and was immediately struck by how different it felt from Los Angeles. 'I didn't expect it to be what it was,' he told Rivals. 'I was more looking at how the social life is and how the weather is. It was really cool, it was really fun and I met a lot of really cool people so I took that into consideration.'
On April 22, 2019, he committed to Duke via video release from Sierra Canyon. Zion Williamson welcomed him with a tweet: 'Welcome to the family.' He was the fifth member of Duke's 2019 class — Coach K's fourth consecutive No. 1 recruiting class — joining Vernon Carey Jr., Matthew Hurt, Wendell Moore Jr., and Boogie Ellis. He chose Duke, 2,500 miles from home, over three schools within driving distance of his childhood bedroom.
His father would be his agent when the time came. That much was already decided.