GSB is a professional services hub aimed at the international business community and part of The Guardian newspaper’s operations.
It is the first account won by FH’s dedicated New York office, which opened at the beginning of the year.
Separately, FH has extended its remit with out-of-home (OOH) media owner Clear Channel Outdoor to handle US comms.
The agency’s business for the client is overseen by its London office and did not previously include North America.
FH New York managing director Jessica Morris will work directly with the head of Clear Channel William Eccleshare to position the business and OOH as the leading media on a global scale.
CEO Fiona Thorne said: ‘We were delighted to be able to appoint Jess as our New York MD earlier this year and it is great to see the business already winning briefs.’