Observed Signal · Jun 3, 2026 · Leadership Change · Source: AdExchanger · Impact: 3/5 · Sentiment: Neutral
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.
Prebid is a central open-source header-bidding organization; leadership departures and strategic focus on agentic protocols (AdCP) could affect publisher standards, demand-side membership, and how agentic advertising and sell-side agents evolve.
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Key Takeaways & Evidence Grounding
- Mike Racic, President of Prebid, is departing to join Knower Tech.
- Christian Janelli, Prebid's Director of Product Management, is also leaving for Knower Tech.
- Garrett McGrath is stepping down as chairman of the Prebid board after five years.
- Joel Meyer, CTO of OpenX, is Prebid's new board chairman.
- Prebid now houses the Ad Context Protocol (AdCP) code for sell-side AI agents and is prioritizing agentic protocols.
Connected Companies & Entities
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Related Market Signals & Shifts
Recent verified developments and strategic activity across this market segment.
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.
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.
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.
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