CBS Radio is wholly owned by CBS Corporation. As of 2011 and probably still current, a majority 79% of the control of CBS Corporation is held by the privately owned National Amusements. 21% of the company is controlled by other shareholders.
National Amusements is entirely held by the Redstone family: Sumner and his children Shari and Michael.
The chairman of the board, the head honcho, the guy in charge, is Sumner Redstone and his kids, Shari and Michael are coming in control of National Amusements, and in turn CBS and all of its underlings (CBS Radio, MTV, BET, Simon and Schuster, Showtime Networks, and all sorts of other toys.
Les Moonves is the President and CEO of CBS Corporation, and Dan Mason is the President and CEO of subsidiary CBS Radio.