Original: In late 2004, Jay-Z, Dash and Biggs sold their remaining interests in Roc-A-Fella Records and the Def Jam Recordings by Island Def Jam chairman L.A. Reid and Jay-Z gained control of Roc-A-Fella Records.
Simplified: He is the former CEO of Def Jam Recordings and Roc-A-Fella Records.