MJM was founded in 1984 and employs 80 people. Its clients include Astra Zeneca, American Express, Pfizer, IBM and Canon. The company had revenues of $25m (£17.2m) in 2000 and net assets of $5.4m (£3.7m) as at December 31 1999.
In a statement, WPP said, "The acquisition strengthens WPP's strategy of maintaining a leadership position in branding and identity consultancy and of strengthening its networks in important growth sectors and markets."