Observed Signal · Sep 10, 2026 · Hiring · Source: AdExchanger · Impact: 3/5 · Sentiment: Positive
Prebid Appoints Former Chairman Garrett McGrath as President
Prebid.org has appointed Garrett McGrath, its former chairman, as its new president, effective September 15, 2026. McGrath, who previously served as SVP of Product Management at Magnite and led Prebid's board for five years until June 2026, succeeds Mike Racic, who departs in October. With over 25 years of experience, McGrath will oversee operational strategy, committee stewardship, and growth. His vision includes supporting multiple agentic AI standards, remaining agnostic to competing protocols, and enhancing publisher monetization through deal curation and data co-ops. He also discussed potential collaboration with Google if mandated by antitrust remedies. Prebid.org is advancing initiatives such as Prebid Sales Agent and enhancements to Prebid Mobile SDK 4.0, emphasizing its role as critical open-web infrastructure and an independent, open-source alternative to walled gardens amid industry shifts.
Leadership change at a core open-source ad tech infrastructure organization signals strategic direction for publisher monetization and agentic AI adoption.
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Key Takeaways & Evidence Grounding
- Garrett McGrath appointed as Prebid.org's president, effective September 15, 2026.
- McGrath served as Prebid's chairman for five years until June 2026 and previously as SVP of Product Management at Magnite.
- Outgoing president Mike Racic will transition until October 15, 2026.
- Prebid will support multiple agentic AI standards, including AdCP, ARTF, and AAMP.
- Prebid is advancing initiatives like Prebid Sales Agent and Prebid Mobile SDK 4.0, and evaluating its role in publisher-led deal curation and data co-ops.
Connected Companies & Entities
7 Entities mapped“Prebid.org has appointed its former longtime chairman, Garrett McGrath, as its second-ever president.”
“Prebid agreed to take on oversight of AgenticAdvertising.org’s sell-side AI agent.”
“McGrath stepped down as SVP of product management at Magnite.”
“Prebid elected OpenX CTO Joel Meyer as its new chairman.”
“Both Google and the Department of Justice have proposed that Google should integrate with Prebid.”
“Prebid could also work with competing standards, such as the IAB Tech Lab’s Agentic Real Time Framework (ARTF) and Agentic Advertising Manag...”
“The FTC lawsuit against Amazon over alleged ad auction manipulation.”
Ontology Mapping & Concepts
Related Market Signals & Shifts
Recent verified developments and strategic activity across this market segment.
Prebid President Mike Racic Departs for Knower Tech
Prebid President Mike Racic is leaving the trade organization to join Canadian tech investor Knower Tech, alongside Prebid director of product management Christian Janelli. Garrett McGrath is also stepping down as Prebid board chairman after five years. Joel Meyer, CTO of OpenX, is the new Prebid board chairman. Racic said he will remain engaged with Prebid in a contributor role because Knower is a Prebid member. The article frames these moves as a leadership transition rather than a brain drain, noting that Prebid’s working-group chairs and core code contributors remain in place. Prebid is focusing on growth, demand-side membership, and technical priorities such as agentic protocols — notably the Ad Context Protocol (AdCP) — which Prebid now houses and which is already being used by some global advertisers.
OpenX CTO Joel Meyer Named Prebid.org Chairman
Prebid.org has appointed OpenX CTO Joel Meyer as its new chairman after he served as interim chair following recent leadership departures. In May, Prebid’s president Mike Racic, chairman Garett McGrath and product director Christian Janelli left the organization. Meyer, a board member since 2023 who also sits on the IAB Tech Lab board, said his immediate priority is hiring a new Prebid president ahead of the Prebid Summit on October 13. Prebid is focusing on helping publishers navigate revenue and traffic declines driven by AI search and new agentic ad-selling tools, while remaining protocol-agnostic and supporting standards such as AgenticAdvertising.org’s AdCP. Meyer emphasized maintaining Prebid’s open-source, neutral role to preserve transparency and collaboration across buyers and sellers as the programmatic ecosystem adapts to agentic and LLM-driven changes.
Knower Tech Hires Prebid’s Racic to Lead Data Curation
Knower Tech — part of holding company Know Co — has hired Mike Racic, the president of Prebid, as managing director to lead a new AI-powered data curation vertical called Rain Barrel. Christian Janelli, Prebid’s director of product management, will join as VP of product strategy. The Rain Barrel initiative will combine existing products (including a product named RainBarrel and a bot‑detection tool called Real Impression) with an AI advisor layer and Knower Tech’s Ads Copilot (ACP) to help independent agencies, brands and publishers activate first‑party data across the open web in a privacy‑safe, transparent way. Racic and Janelli will transition out of Prebid over the coming months; Prebid will search for a new president but will continue collaborating with the Agentic Advertising Org.
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