The two firms will remain in their existing offices, and the move is not understood to have resulted in redundancies. Both agencies bring eight staff into the merged firm, which boasts fee income of around £1.3m, derived almost equally from the two agencies.
Ex-Radius MD Louise Blakeborough becomes chairman of Harvard Health, with her former deputy Hilary Franklin becoming deputy MD of the new agency.
Jarman said the two firms worked in different areas, eliminating client and staff overlap: 'Radius is more into bio-tech and ethical pharmaceutical work, whereas Harvard tends to focus on consumer healthcare,' he said.
He added that the decision to retain the two offices - Radius's in West Byfleet and Harvard's near Heathrow - was due to the fact that senior consultants in both agencies had already established themselves in those locations.
Harvard Health will operate as part of the Harvard PR group, under overall control of Harvard PR MD Gareth Zundel.