Mark OBrien

The Person

Mark OBrien

Mark O’Brien

Revolving Door

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February 11, 2013: Mark O'Brien has been named Washington, D.C. market manager at Cumulus Media. He had been VP and market manager at Clear Channel. (release)

December 3, 2010: Mark OBrien has been named North American president at DDB. He had been North American chief operating officer there. (AgencySpy)