Miami-based Open named Millie Vergara as managing director to lead U.S. operations and collaborate on global client campaigns.
Previously, Vergara worked as a strategic leader at McDonald's launching marketing campaigns, new brands and products.
"Her experience, business acumen and creative vision will be an immense asset to Open during this vital moment in our short history," said Máximo Lorenzo, managing partner at Open.
Vergara has also held senior posts at McCann, FCB and Lopito, Ileana & Howie.
She has led numerous value-added programs, including revenue-focused initiatives, profit recovery, market-share participation, brand development and advertising initiatives.
Sebastián Marvin, creative partner for Open, said her market knowledge and experience will "add immense value to our clients and our team."
Open focuses on business strategy, analytics and media, with offices in the U.S., Buenos Aires, Madrid and Barcelona.
Agency clients include Hard Rock Cafe, Scenic Luxury Cruises & Tours, Emerald Cruises, Freddo y California Walnuts.