This dissertation addresses the issue of expertise in climate change and pandemic preparedness. Economies and societies around the world are increasingly facing the consequences of a changing climate and more frequent infectious disease outbreaks. These problems are generally articulated as issues that require for their handling new forms of expertise and expert institutions that enable states to intervene in new ways. However, most existing research on climate and pandemic preparedness expertise tends to either focus solely on the transnational sphere or see the state and expertise as distinct. As a result, the role of the state in shaping climate and pandemic preparedness expertise remains underexplored.