She has been hired to add strategic depth to the network's offering, as well as working across its Mars portfolio alongside Patrick Collins, the worldwide managing director for the confectioner.
She will also develop and drive the network's disruption and media arts philosophies.
Tom Carroll, the president and chief executive of TBWA\Worldwide, said: "This appointment reflects the tremendous contributions Suzanne has made to the Mars business around the world.
"Her understanding of how to help global brands strategically position themselves will prove invaluable as we expand her responsibilities across the network."
Powers was previously the account planning director at TBWA\ New York, where she worked on Absolut, Nivea and Hotels.com.
She joined from TBWA\Chiat\Day, where she worked on Mars, PlayStation and Visa.
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