As revealed on prweek.com/uk, Dewhurst has joined the financial PR agency as a senior consultant. He previously spearheaded UK comms for Russian energy giant Gazprom.
He joined Gazprom from British Nuclear Fuels and has also worked at Railtrack and the Chemical Industries Association, as well as serving as UK CEO of Weber Shandwick.
Dewhurst said: 'I do not think there are any in-house jobs out there that match either the nuclear industry or Gazprom in terms of the challenges and issues they bring.'
He will work closely alongside fellow senior consultant Geoff Potter, who led GlaxoSmithKline's global corporate comms function for 23 years.
Dewhurst added: 'Even the best corporate affairs director will sometimes face challenges they have not dealt with before. Geoff and I will look at comms from the perspective of what the comms director wants, rather than just what an agency typically offers.'