Dunkin' Brands runs on mobile. That's the message from Global Marketing and Innovation Officer John Costello, a seasoned marketing executive who has been in that post for a year and at the company for five years, after previously heading up marketing at Home Depot. He's put mobile at the core of Dunkin's consumer-engagement efforts, pointing to its "single-screen strategy with mobile at the center of that" as the best way to reach its "authentic," "multi-viewing" customers. "For a brand on the run, mobile is perfect."