David Ellison is negotiating to keep CNN’s chief executive, Mark Thompson, in place without oversight from Bari Weiss, the CBS editor in chief, when the networks’ parent companies merge.

Ynon Kreiz, who will work alongside David Ellison at the merged company, helped turn Barbie into a blockbuster movie.

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Cindy Holland’s departure clears the way for Casey Bloys, the HBO chairman, to have a leading role in the combined company’s streaming services.

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