Mountford, who started this week, will work across a number of the agency's clients, including Scotch whisky brand The Macallan and Sony.
She will report to The Romans co-founder and creative director Joe Sinclair, and will sit within a creative team that also includes Paul Stollery, who was hired to the role of associate creative director in June.
Sinclair said: "Modern PR clients expect there to be a creative lead on their account and so we're answering this need by building a proper creative department that makes proper creative work."
'No connection' to Oakbay work
Before joining The Romans, Mountford spent two years at Bell Pottinger, latterly as associate creative director working within its new Engage by Bell Pottinger offering.
The agency has come under intense scrutiny in recent months, culminating in the agency facing a series of probes over its work with Oakbay, the holding company for the Gupta family, which has ties with South African president Jacob Zuma.
However, Sinclair told PRWeek Mountford had no involvement with Bell Pottinger's work for Oakbay. At Engage, Mountford handled PR for clients including South African Tourism UK, Air France KLM and Yorkshire Bank.
Before Bell Pottinger, Mountford was a creative at Weber Shandwick. She joined the agency in 2013 as a junior copywriter, prior to which she spent two-and-a-half years earlier in her career acting in Endemol-produced South African soap Isidingo.