Brian Wieser is Principal of Madison and Wall, a strategic consultancy for the media and technology industries. Described as “Madison Avenue’s de facto Chief Economist,” Brian was most recently Global President at WPP’s GroupM, the world’s largest media services firm where he was a member of its executive committee and where he oversaw the agency holding company’s industry forecasting efforts. His work was specifically cited by Mediapost as a factor in its selection of GroupM as “Holding Company Entity of the Year” in 2023. He also worked in a similar capacity at Interpublic’s Magna Global. Brian’s Wall Street experience includes time as an Institutional Investor award-winning analyst for the independent firm Pivotal Research and at Deutsche Bank. He started his career at Lehman Brothers as an investment banker.