Ryan Daniel Montgomery (born July 5, 1977), known professionally as Royce da 5’9″, is an American rapper and songwriter. Montgomery is currently one half of the rap duo Bad Meets Evil with fellow Detroit rapper Eminem, and is one half of the hip hop duo PRhyme with producer DJ Premier. He was also one quarter of the hip hop group Slaughterhouse with Joe Budden, Joell Ortiz and Kxng Crooked. Alongside his recording career, Montgomery served as a ghostwriter for the likes of Puff Daddy and Dr. Dre. The editors of About.com ranked him No. 31 on their list of the “Top 50 MCs of Our Time (1987–2007)”.