Jeff Shell, who oversaw the media company before him, was fired after an investigation into sexual harassment.
Linda Yaccarino, who ran the company’s multibillion-dollar ad business, left abruptly this month to become the chief executive of Twitter.
NBCUniversal is losing billions on its streaming service, Peacock, while viewership of its traditional TV networks continues to fade.
In 2008, when the U.S. financial system was on the brink of failure, Mr. Cavanagh was a senior executive at JPMorgan Chase, one of the few major banks that was not at risk of collapse.
He spent time alongside Jamie Dimon, JPMorgan’s chief executive, and other executives during all-nighters to work out the details of acquiring Bear Stearns, a rival on the verge of bankruptcy.