Richard published a monograph for Cambridge University Press in 2019 applying republican theory to the EU entitled A Republican Europe of States: Cosmopolitanism, Intergovernmentalism and Democracy in the EU A collection of 20 articles on this topic written over the past 25 years with Dario Castiglione also appeared in 2019 and was published by Rowman and Littlefield as From Maastricht to Brexit.
He is currently writing a book on The Democratic Constitution for Oxford University Press, and engaged in a study of Political Leadership provisionally titled The Democratic Prince. With Jeff King at UCL he is co-editing the Cambridge Handbook to Constitutional Theory for Cambridge University Press.
He has a number of articles and book chapters in progress relating to all these book projects.