Marshall Bruce Mathers III (known by his primary stage name "Eminem", or by his alter ego "Slim Shady"), is an American rapper, record producer and actor. Eminem quickly gained popularity in 1999 with his major-label debut album The Slim Shady LP, which won a Grammy Award for Best Rap Album. The following album, The Marshall Mathers LP, became the fastest-selling hip hop album in history. It brought Eminem increased popularity, including his own record label, Shady Records, and brought his group project D12 to mainstream recognition.