Brian Lesser returned to WPP's GroupM as CEO in July 2024, after several years leading AT&T's digital ad business, and then spearheading the data startup InfoSum. In his first-ever public interview since taking the role, hosted by ADWEEK's executive editor Alison Weissbrot, Lesser will delve into how the world's largest media buyer plans will capitalize on a rapidly evolving media marketplace. From harnessing data, tech, and AI to stay ahead, to restructuring and training talent to thrive in a new landscape, this conversation will shed light on how one of the world's largest media investment companies is navigating disruption, fostering growth, and redefining success for the future.