The account will be managed by the agency's New York office.
The agency fought off competition from McCann Erickson in New York, its sister agency TM Advertising in Irving, Texas and Leo Burnett in Chicago.
Foote Cone & Belding and DDB in New York were knocked out in the previous round in December 2005.
The review was part of ExxonMobil's policy to review all of its contracts every three years and was managed by the intermediary AAR Partners in New York.
The Texas-based oil giant spent $13 million on corporate advertising in 2004. However, it significantly increased that spend the following year to $36 million in the first ten months of 2005.