Prebid.org confirmed Joel Meyer, CTO of OpenX and a Prebid board member since 2023, as its new chairman on 24 August, ending a leadership vacancy that opened in May when president Mike Racic, chairman Garett McGrath and director of product management Christian Janelli all departed within weeks of each other. Meyer had been serving as interim chair; the organization still needs to name a permanent president, and it wants that done before the Prebid Summit on 13 October. He is also a sitting IAB Tech Lab board member, which puts one person inside the governance of both standards bodies now jostling over agentic ad tech.
That dual seat matters because Prebid is not walking into a quiet period. The open-source header-bidding software that most GAM and GCPP publisher stacks already run underneath is trying to stay relevant while three separate protocol efforts — the IAB Tech Lab’s Agentic Advertising Management Protocols (AAMP), the newer Ad Context Protocol (AdCP), and the underlying MCP transport layer both use — compete to define how software will buy inventory from software. Meyer’s own framing, in his first remarks as chairman: “It’s always best if there is one protocol…there will always be more than one.” Prebid’s answer to that is not to bet on a winner. It’s to stay protocol-agnostic and try to keep publishers able to sell into whichever one wins.
01Why this matters for publishers
| The leadership reset lands on top of, not instead of, the standards fight | Three departures in one month is real governance churn at the organization that runs the header-bidding layer inside most GAM stacks — Prebid needs to fill the president's seat and hold a coherent position on AAMP/AdCP/MCM at the same time. |
|---|---|
| "Protocol-agnostic" is a real commitment, not a hedge | Meyer's stated priority is extending Prebid's transparency work "beyond the software we control and further downstream" — i.e., following inventory into whichever agentic protocol a buyer's agent actually uses, rather than requiring publishers to bet on one. |
| The growth number is the leverage | Prebid says it has grown membership 300% over the past five years and wants to repeat that pace. The more of the supply side that runs through Prebid, the more it can force AAMP and AdCP to interoperate with what publishers already have, instead of publishers re-plumbing for both. |
| This is a governance story with a deadline | The Prebid Summit on 13 October is the natural checkpoint for whether a permanent president — and a clearer agentic-protocol position — actually materializes. |
Prebid just handed its chairmanship to someone who sits on the rival standards body's board too, and his first public position is a refusal to pick a winner.
02What publishers should do
03The bottom line
Prebid just handed its chairmanship to someone who sits on the rival standards body’s board too, and his first public position is a refusal to pick a winner. For publishers running Prebid inside GAM today, that’s the correct call for now — but it also means the header-bidding layer isn’t going to resolve the AAMP-vs-AdCP question for you. The governance churn is real, the growth number is Prebid’s actual leverage, and 13 October is the date to check whether “protocol-agnostic” turned into a shipped integration or stayed a talking point.