Christopher Edward Martin aka DJ Premier (also known as Preemo), is an American record producer and DJ. He is considered one of the greatest hip hop producers of all time. He was half of the hip hop duo Gang Starr—alongside the rapper Guru—and presently forms half of the hip hop duo PRhyme, together with Royce da 5'9".  

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Premier is known for producing all of Gang Starr's songs as well as many of those composed by the Gang Starr Foundation. Notable artists he has worked with include Anderson .Paak, AZ, Big Daddy Kane, Big L, Blaq Poet, Bun B, Canibus, Christina Aguilera, Common, D'Angelo, Dilated Peoples, D.I.T.C., Dr. Dre, Fat Joe, The Game, Ill Bill, Janet Jackson, Jay-Z, Joey Bada$$, Kanye West, KRS-One, The Lady of Rage, Limp Bizkit, Lord Finesse, The LOX, Ludacris, Mac Miller, Mobb Deep, M.O.P., Mos Def, Nas, The Notorious B.I.G., O.C., Papoose, Rakim, Royce da 5'9", Snoop Dogg, Xzibit and more. Source.