In the newly created role, Green (pictured left) will oversee the 10 Grey Shopper agencies and will report to global chief executive Joe Lampertius.

Robert Sellers (pictured right), who has been a director at the agency for almost three years, will succeed Green as managing director.

The appointment comes at a time of rapid expansion for the network, which has grown through the acquisition of shopper marketing agencies around the world and organic growth, particularly through P&G client wins. The company has also just hired Peter Viento as its first global Group ECD from US agency, Colangelo.