The agency, which was hired following a four-way pitch, will create a series of campaigns in the run-up to the 2009 Ashes series.
The club is ramping up its marketing activity in an attempt to increase match attendances and membership. It also plans to boost its programme of conferences and non-cricket-related events at its home stadium, The Brit Oval, promotion for which will also be handled by the agency.
The cricket club is currently awaiting a decision on a planning permission application to Lambeth Council to begin a £35m development of The Oval involving the construction of a new stand, improved spectator facilities and a hotel. A decision is expected by the end of October.