Chief Operating Officer at Magnite
Kartzman is known for his operational leadership in scaling Magnite through major industry consolidation and for his deep expertise in CTV and video programmatic monetization on the sell side.
Last updated Feb 27, 2026 by AI Enrichment
Ben Kartzman is a senior ad tech executive best known for his operational leadership at Magnite, the industry's largest independent sell-side platform. As COO, he oversees the day-to-day operations of a company that processes billions of programmatic transactions daily, serving thousands of publishers across display, video, and connected TV. His role has been central to integrating the complex organizational and technical infrastructure that emerged from Magnite's series of major acquisitions, including the foundational merger of Rubicon Project and Telaria, and the subsequent acquisition of SpotX in 2021. Before joining Magnite's orbit, Kartzman built his reputation in video and CTV advertising at SpotX, where he held senior leadership responsibilities focused on scaling the platform's publisher monetization capabilities. Earlier in his career, he held roles at Tremor Video, giving him formative experience in the emerging world of programmatic video at a time when the category was still defining its standards and infrastructure. This trajectory gave him a distinctive vantage point on the convergence of traditional TV and digital advertising. Kartzman is regarded as a pragmatic operator who excels at scaling ad tech businesses through periods of rapid consolidation and technological change. His expertise spans supply-side platform optimization, CTV monetization strategy, and the operational complexity of managing large-scale programmatic marketplaces. He is a recognized voice on the challenges publishers face in maximizing yield in an increasingly fragmented and privacy-constrained digital advertising environment.
SpotX (prior to 2021)
Tremor Video (prior to SpotX)