Summer Redstone was an American businessman and media magnate. He was the majority owner and chairman of the board of the National Amusements theater chain. Through National Amusements, Redstone and his family are majority voting shareholders of Viacom CBS (itself the parent company of CBS, MTV, TV Land, VidCon, Smithsonian Channel, CBS Television Studios, CBS Productions, Showtime Networks, Nickelodeon, Paramount Network, Big Ticket Television, Viacom CBS Domestic Media Networks, Viacom CBS Networks International, Comedy Central, Paramount Pictures, Miramax, CBS Television Stations, Network 10 and TV distributor CBS Television Distribution). According to Forbes, as of September 2015, he was worth US$5 billion.

Redstone was formerly the executive chairman of both CBS and Viacom. In February 2016, at age 92, Redstone resigned both chairmanships following a court-ordered examination by a geriatric psychiatrist. He was ultimately succeeded by Les Moonves at CBS and Philippe Dauman at Viacom. Source  Wikipedia-

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