The UN Convention Against Corruption is the only truly global convention in corruption control. Separate and rather difficult negotiations were conducted on a mechanism for the implementation of the treaty. These negotiations broke ground by providing, for the first time, peer review of a United Nations treaty. This article, which is based on the authors' close observations and interviews with key participants, seeks to show how the dynamics between technical experts and diplomats led to a resolution that would not have occurred if either the technical experts or the diplomats had acted alone.