The news stunned many in the world of cable news, where Mr. Lewis, an executive vice president who ran the aggressive communications and public relations arm of Fox News, was long thought to be an indispensable adviser to Mr. Ailes.
During his final years Las Casas came to be the indispensable adviser both to the Council of the Indies and to the king on many of the problems relating to the Indies.
After Faisal was made King of Iraq, Bell became his indispensable adviser, a "right-hand man," as the British press clippings shown in "Letters from Baghdad" put it, but she was later marginalized by other influence-seekers.
And previous presidents have had indispensable policy advisers: think of Harry Hopkins in FDR's administration.
For Mr. Obama, however, Mr. Geithner has emerged as the indispensable economic adviser who has outlasted every other member of the original inner circle and whose successes easily outweigh his missteps.
For President Obama, Treasury Secretary Timothy F. Geithner has been the indispensable economic adviser who has outlasted every other member of the original inner circle, reported Jackie Calmes of The New York Times.
But during last year's election campaign there he was, once again near the top, acting as an indispensable foreign-policy adviser and trouble-shooter to the chancellor-to-be, Gerhard Schröder.
A man of the highest integrity and who, through expert knowledge and great experience, an affable and generous nature and an ability to get on with people from all walks of life and political persuasions, made himself indispensable as a veterinary adviser to the UK Parliament.
What's more, he said, she was an indispensable filter for noise of other advisers, pollsters and consultants.
Pence will say that Europe is an "indispensable partner" for the United States, a senior White House foreign policy adviser told reporters.
