Murray joins from Hume Brophy, where he has worked since the start of 2017. He will work across Cicero's consumer, digital, PR, market research and public affairs teams.
Murray, a 15-year veteran of the sector, was director of communications at Metro Bank when it listed on the London Stock Exchange, and led the successful campaign for HS2 when head of government affairs at the engineering giant Ove Arup and Partners.
Jeremy Swan, CEO of Cicero Group, said: "A respected industry heavyweight, Peter brings valuable in-house and agency experience to our growing team. His appointment will ensure we continue to deliver creative campaigns that are seamlessly coordinated and powerful executed."