Melvin Alan "Mel" Karmazin is an American executive. He co-founded and was the president of Infinity Broadcasting and eventually became the president and CEO of CBS. From 2004-2012, he was the CEO of Sirius Radio. In October 2012, Karmazin announced that he would be stepping down on February 1, 2013. Upon his departure, John C. Malone took over Karmazin's role at SiriusXM.