Crook joins from integrated financial agency Tangible, where she was head of business development for seven years.
Her appointment continues a move by chief executive Michael Richards to strengthen WFCA's management team, following its merger with Ekay last April.
In December, WFCA, promoted its media director and co-founder of MediaCom, Bill Jones, to its board.
Other moves since the acquisition include Stephen Wise being promoted to group business development director, Steve Latter being made finance director and Nigel Palmer becoming client services director.
Based in Kent, WFCA clients include AXA, Bathstore, The Perfume Shop and BMI Healthcare.
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