Grey was appointed in October 2013 as deputy MD, with the intention she would move into the MD role. The London office was previously headed up by Sally Ward, who is continuing as EMEA president.
As deputy MD Grey has overseen client wins including General Electric and the Technology Strategy Board.
Before joining Porter Novelli, she spent six years at Freuds on the senior management team as a board director, working with clients including Asda, Mars, Vodafone, PepsiCo, Bupa and Eurostar.
Before Freuds, Grey was a director at Weber Shandwick.