Who initiated the careers of LL cool J and Will Smith?

LL Cool J's career was initiated by Def Jam Recordings co-founder Rick Rubin, who produced his debut album "Radio" in 1985, helping to establish him as a prominent figure in hip-hop. Will Smith's career was launched by his role in the television series "The Fresh Prince of Bel-Air," which was co-created by Quincy Jones and served as a platform for Smith's transition into music and film.