The resurgence of authoritarian tendencies in Western democracies has made understanding the conditions of legitimate authority critically important. Determining when authority is morally justified requires rigorous analysis of the core concepts of law, authority and legitimacy. This Fellowship highlights the importance of methodological work, recognising that careful conceptual analysis is essential to conceptual engineering and re-engineering – approaches that aim to revise or create concepts when existing ones have problematic social implications. Professor Himma will work in collaboration with the Surrey Centre for Law and Philosophy, resulting in a series of academic publications alongside activities aimed at public engagement and broader impact.