Rick Rubin left Def Jam in 1988 to form his own label leaving Russell Simmons to head of the company. Def Jam continued to expand in the early 90s, attracting a new generation of rap artists such as West Coast producer/rapper Warren G. 
Rick Rubin left Def Jam in 1988 to form his own label leaving Russell Simmons to head of the company. Def Jam continued to expand in the early 90s, attracting a new generation of rap artists such as West Coast producer/rapper Warren G.