Five months into her tenure as Uber's first chief brand officer, Bozoma Saint John is making her first big marketing move with the debut of an NBA-themed national ad campaign, "Rolling With the Champion." Her company tapped LeBron James and Maverick Carter's digital media company Uninterrupted for the effort, which stars ESPN SportsCenter co-anchor Cari Champion, newly trained as an Uber driver, transporting NBA rookies like the L.A. Lakers' Lonzo Ball and Kyle Kuzma as she digs into their personal stories.