Def Jam Records is an American record label founded in 1984 by Rick Rubin. It was initially known for promoting hip hop and urban music. Some of its most popular early artists included LL Cool J and Beastie Boys. While Rubin left in 1988, Russell Simmons remained as head and expanded the label's success. Over time, Def Jam broadened its musical genres and ventured into film. Jay-Z became the company's CEO in 2005. The label continues to represent prominent artists across hip hop, R&B, and other genres.