Andrew McKenzie-McHarg is a historian whose research interests extend from early modern forms of anti-Jesuit rhetoric to the emergence of the modern disciplines of social science in the twentieth century. He studied at the Free University of Berlin and at the University of Erfurt, where, in addition to writing his PhD, he developed an interest in currents of radical thought in late Enlightenment Germany. From 2013 to 2018 he was a member of the Conspiracy and Democracy Project, a five-year project funded by the Leverhulme Trust and based at CRASSH (Centre for Research in the Arts, Social Sciences and Humanities) at the University of Cambridge. His major output from this project is the book The Hidden History of Conspiracy Theory, which examines the tensions that arise under the conditions of modern, democratically governed societies in which conspiracy theories have been delegitimized by modern social science yet encouraged by trends in democratic politics. He is now working on a book on the conceptual history of conspiracy theories.