During their two-year spell at MCBD, the pair, who both write and art direct, created the "hello world" campaign for Travelocity starring Alan Whicker. They were also responsible for the agency's current Millets campaign.
Before MCBD, Tollett and Stamp spent three years at Leagas Delaney, where they worked on the Harrods and Adidas accounts.
Jeremy Craigen, the executive creative director at DDB London, said: "I don't think there's a single agency in the UK that wouldn't want Ben and Emer working in their creative department, so I'm delighted and flattered that they have decided to join DDB London. Plus, anybody who falls off a stage while collecting an award has just got to work here."