In the role, Quish will oversee JWT's officers in Atlanta, Chicago, Los Angeles, San Francisco and Toronto as well as the JWT Technology division.
He will work alongside Rosemarie Ryan, president of JWT's New York office, and George Rogers, president of the Detroit office, and reports to JWT worldwide CEO and chairman Bob Jeffrey.
JWT is the largest agency in the US and the fourth largest in the world.
"As the largest network in the US, this is about delivering more, better and faster for clients. I am confident in our ability to maintain and grow our leadership position in North America," Jeffrey said.
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