because he hates George Martin.... Frederick Jay "Rick" Rubin (born March 10, 1963) is an American record producer and the co-president of Columbia Records. Along with Russell Simmons, Rubin is the founder of Def Jam Records and also established American Recordings. With the Beastie Boys, LL Cool J, Public Enemy and Runâ€“D.M.C., Rubin helped popularize hip hop music. Rubin has worked with artists as varied as Beastie Boys, LL Cool J, Public Enemy, Runâ€“D.M.C., Tom Petty, Black Sabbath, Trouble, Slipknot, Slayer, Red Hot Chili Peppers, The Mars Volta, Jay-Z, Danzig, Dixie Chicks, Metallica, AC/DC, Aerosmith, Weezer, Linkin Park, The Cult, Neil Diamond, Mick Jagger, System of a Down, Rage Against the Machine, Melanie C, Audioslave, Sheryl Crow, The Avett Brothers, Adele and Nusrat Fateh Ali Khan. In the 1990s and 2000s, he produced the "American Recordings" albums with Johnny Cash. MTV called him "the most important producer of the last 20 years." In 2007, Rubin was listed among Time's 100 Most Influential People in the World.