Alexa Chopivsky worked at the US news broadcaster for over seven years, spending time in the London, New York and Washington bureaus.
She reported on global events and spent six months in New Orleans in the aftermath of Hurricane Katrina.
She has now joined The Communications Group as associate director in the corporate affairs division.
She will report into corporate affairs MD Emma Johnson and is expected to work on clients De Beers Group Marketing and Ricoh.
Chopivsky has also spent time working with Hillary Clinton's chief of staff at The White House in the late 1990s, and with the US department of state at the US embassy in Paris.