Global 20: Mayer Brown

By Chelsea Naso (July 23, 2015, 3:21 PM EDT) -- Mayer Brown LLP has championed several complex cross-border deals in the last year, including France-based Altice SA's €7.4 billion ($8.1 billion) acquisition of PT Portugal SGPS SA, as the Global 20 firm continues expanding far outside its Chicago origins.

In the last 15 years, Mayer Brown has grown aggressively from Chicago-based to global, with a significant footprint in the world's major financials centers and a strong presence in the cities and industries that are key to clients' needs, explained firm chairman Paul Theiss.

"We've been working hard at it for about 15 years," he said. "That's been an effort that has...

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