He was promoted to president and CEO of CBS Television in 1998, and became chairman in 2003.
- CBS Chief Executive Les Moonves is officially out at the network following new allegations of sexual misconduct.
What are the latest claims?
Six women leveled sexual harassment and assault allegations against the executive in an explosive expose in the New Yorker on Sunday by Ronan Farrow.
One accuser, Phyllis Golden-Gottlieb, filed a criminal complaint with the LAPD previous year, the New Yorker reported, detailing allegations of physical violence and forced oral sex by Moonves, which unnamed law enforcement sources told the magazine were credible, though the relevant statutes of limitations had already expired. Some of them also said Moonves retaliated after being rebuffed, damaging their careers.
TV executive Phyllis Golden-Gottlieb and writer Jessica Pallingston are two of the women who give graphic descriptions of the misconduct they accuse Mr Moonves of carrying out. "It's a watershed moment", Moonves said at a conference in November.
Moonves acknowledged three of the newly described encounters, but said they were consensual, in a statement to the New Yorker.
"As I understand the allegations, and he denies them, but as I understand them, they allege that he used his corporate authority to badger and in some cases to force women to touch his body and in a way that they didn't want to", he said.
For its part, CBS has since stated, "CBS takes these allegations very seriously".
A confidentiality clause, however, may prevent the findings of the investigation from ever being revealed.
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What were the earlier allegations?
Moonves and CBS will donate $20 million to one or more organizations that support the #MeToo movement and equality for women in the workplace. "We believe them", Times' Up said in a statement early Sunday.
"I have been with this Company for 21 years, and I look forward to providing continuity and stability, while at the same time fostering our culture of innovation", Ianniello wrote in the email to CBS employees, according to HuffPost.
"Whatever times I've had of hardship over the last eight years, Julie has always been there for me", said Osbourne.
CBS shares rose in recent days as the prospect of Moonves's exit - and the settlement of the broadcaster's dispute with the Redstone family - suggested the company would enter a period of calm.
CBS will pay ousted chief Les Moonves $120 million if its ongoing investigation fails to find any evidence of sexual misconduct.
The sum being floated in the media for his resignation package is some $100m (£77m).
These are the latest accusations against Moonves, following a July report with six initial women's stories that prompted the CBS board to investigate Moonves' conduct and consider his departure. He could even receive nothing, some reports say.
Moonves, who orchestrated CBS's revival into a ratings victor, had been one of the most respected executives in Hollywood until he was accused in late July of inappropriate behavior stretching back decades.
Despite all of his responsibilities at the network, Moonves continued to play an active role in CBS' reality shows, from bringing Survivor to the network in 200 to approving the final casts for each of the shows, including Big Brother and The Amazing Race.
For a decade under his leadership, CBS has been the most-watched network in the United States, narrowly retaining its crown ahead of NBC in the 2017-18 season. The executive is one of the highest compensated in media, making $69 million a year ago, according to regulatory filings.