Mark O'Brien

Mark O'Brien is an experienced executive in the branding and advertising industry, currently serving as CEO of the Omnicom Brand Consulting Group since May 2021, after holding the position of COO from April 2018 to November 2019. Mark previously served as Global Chief Operating and Financial Officer at Interbrand, overseeing operations across 24 offices in 17 countries. Prior to that, Mark held various leadership roles at DDB Worldwide, including President and CEO of North America and Chief Financial Officer for North America and Asia Pacific. Mark's career began at Arthur Andersen & Co., where responsibilities included auditing and managing SEC filings. Mark holds a BS in Accountancy from the University of Mississippi.