President and Chief Operating Officer at PubMatic
McGrath is known for scaling PubMatic's publisher development and global operations over a decade, playing a central role in the company's growth and its 2020 Nasdaq IPO as a leading independent SSP.
Last updated Feb 27, 2026 by AI Enrichment
Garrett McGrath is a senior operator in the programmatic advertising industry best known for his decade-long tenure at PubMatic, where he has helped transform the company from a growing SSP into one of the most prominent independent supply-side platforms in the world. As President and COO, McGrath oversees global operations, go-to-market strategy, and publisher development — functions central to PubMatic's ability to compete against both walled gardens and larger holding company-owned platforms. His leadership has been a consistent thread through PubMatic's most significant milestones, including its Nasdaq IPO in December 2020. McGrath joined PubMatic in 2015 and rose through a series of senior leadership roles, most notably as Senior Vice President of Publisher Development, before ascending to his current position. In that capacity, he built and scaled the publisher-facing side of the business, deepening relationships with premium media owners and expanding PubMatic's footprint across display, video, mobile, and connected TV inventory. His deep expertise in publisher monetization and supply-path optimization has made him a credible voice on the structural challenges facing the open web. Before PubMatic, McGrath accumulated experience at other AdTech companies, developing a foundation in programmatic infrastructure and digital media that would inform his later work on the supply side. He is regarded within the industry as a disciplined operator who balances commercial growth with the technical and strategic complexity of running a scaled SSP — a combination that has been critical to PubMatic's sustained positioning as a leading independent alternative in a consolidating market.
PubMatic (2015-2022)
PubMatic (2015-2022)