He is one of the earliest rappers to achieve commercial success, alongside fellow new school hip hop acts Beastie Boys and Run-DMC.

Signed to Def Jam Recordings in 1984, LL Cool J's breakthrough came with his single "I Need a Beat" and his landmark debut album, Radio (1985). He achieved further commercial and critical success with the albums Bigger and Deffer (1987), Walking with a Panther (1989), Mama Said Knock You Out (1990), Mr. Smith (1995), and Phenomenon (1997). His twelfth album, Exit 13 (2008), was his last in his long-tenured deal with Def Jam.