Matt Sweeney is Chief Investment Officer of GroupM U.S. A member of GroupM’s North American Executive Committee, Matt oversees all GroupM’s investment and media implementation functions, covering approximately $15 billion in client billings. His role encompasses leading the operational simplification of GroupM U.S.’ investment infrastructure and accelerating the integration of linear and platform-enabled automated buying in an increasingly addressable marketplace.

Matt formerly served as CEO of Xaxis North America where he oversaw strategy and operations at the advanced programmatic media division of GroupM across the U.S. and Canada. Matt was instrumental in helping clients leverage data and artificial intelligence to deliver business outcomes on behalf of brands and agencies.

Matt brings over 20 years of success directing management, sales and operations within start-up and established media organizations, including as SVP of Client Engagement for Xaxis as well as CEO and President of IDG's Computerworld and InfoWorld.