CEO, Sirius Satellite Radio (SIRI)A former top Viacom executive, Karmazin is looking to join forces with Sirius archrival XM Satellite Radio in a merger that would create one dominant satellite-radio company. The deal's outcome is far from certain, pending government reviews, but the merger agreement makes Karmazin CEO of the combined company. There's no doubt who's the top dog in the business today.
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