Darragh joined last week in the newly-created position and has been tasked with leading the agency's social marketing practice, McCann Live, whose clients include Cereal Partners UK and Premier Foods.
He is one of four managing partners at McCann London and will join the agency’s board. He will report to the agency’s chief executive, Zaid Al-Zaidy.
Al-Zaidy said: "Michael has the creative instinct, gravitas, depth of experience and hunger that we value so enormously at McCann. With Michael joining the team, I am confident that we will take our existing social, digital and content offering to the next level."
Darragh had been at Ogilvy PR London since 2010 helped launch the agency launch its social practice. Before that he was Ogilvy PR China’s head of digital.
He said: "McCann have the important components in place: a great team, a strong platform of existing clients and social and content capabilities on which we can build. This opportunity was one that I couldn’t ignore."