He is also taking on lead responsibility for talent development at Fishburn and joining its management board.
He will report to Fishburn CEO Ali Gee and work alongside other MDs Nadia Gabbie, consumer; Paul Farrow, financial and professional services; and Rory Scanlan, public affairs.
It is understood he handed in his notice at Edelman, where he is a senior director and a member of the leadership team, last week.
He has worked with clients including Diageo, Microsoft, Barclays, GE and the FA Premier League, specialising in reputation and issues management, corporate campaigning and executive positioning.
Before Edelman he spent five years as head of communications at Network Rail.
The Fishburn management recently defended its restructuring of the agency, which saw Fishburn Hedges, 77 and Further combined into a single operation at the beginning of this year.