Sumner Redstone's media empire dates back to the ... He was the executive chairman of CBS and Viacom until 2016, and chairman emeritus after that. He notably remained involved deeply involved ...
Sumner Redstone stepped down from his position as chairman of CBS and Viacom in February 2016, prompting a nasty legal battle between former Viacom chairman Philippe Dauman and Shari Redstone on ...