A career diplomat, David Frost has built a reputation for discretion and has kept a relatively low profile.
Under the presidency of Boris Johnson, he became one of the most powerful men in the country in less than six months.
Mr Frost, a special adviser, now takes on the role of Britain’s chief negotiator with the EU and national security adviser, exercising enormous influence across the government.
By giving Mr. Frost a dual role, the government is sending Brussels a clear signal that it wants negotiations to end as soon as possible.
In Michel Barnier the European Union has a single figure devoted to negotiations, but Mr. Frost’s time and energy will necessarily be shared. Mr. Johnson said