CEO at GroupM Nexus
Bridging premium publishing and programmatic technology across both buy- and sell-side organizations, and leading GroupM's adtech and addressable media infrastructure at global scale.
Last updated Feb 27, 2026 by AI Enrichment
Kirk McDonald is one of the most seasoned executives bridging the worlds of premium publishing and programmatic advertising technology. As CEO of GroupM Nexus, the addressable content and commerce division of GroupM, he oversees the adtech infrastructure, data partnerships, and commerce capabilities that underpin advertising for some of the world's largest brands. His leadership at GroupM Nexus positions him at the center of the industry's most pressing challenges: identity resolution in a post-cookie world, the growth of retail media, and the evolution of programmatic buying at scale. McDonald's career reflects a rare ability to operate effectively on both the buy and sell sides of the digital advertising ecosystem. Before GroupM, he served as President of PubMatic, a leading independent sell-side platform, where he helped sharpen the company's market positioning and accelerate its growth during a critical period of consolidation in the SSP landscape. Prior to that, he spent years at Time Inc. in senior leadership roles including President of Advertising, where he guided one of the most storied legacy media companies through the turbulent transition to digital-first advertising models. With over two decades in the industry, McDonald is recognized as a thought leader on programmatic advertising, publisher monetization, and addressable media. He is a frequent presence at major industry conferences and has been a consistent voice on topics ranging from the future of the open web to the role of data transparency in rebuilding advertiser trust. His experience across publishers, platforms, and holding companies gives him a uniquely holistic perspective on the structural forces reshaping digital media.
PubMatic (2019-2022)
Time Inc. (2015-2019)
Time Inc. (2012-2015)