H. Patrick Glenn, Professor of Law and former Director of the Institute of Comparative Law at McGill University, passed away in 2014. For the past decades, he had been a central figure of legal scholarship, especially in the global discourse on comparative law. This chapter is the introduction to a collection that intends to honour Professor Glenn’s intellectual legacy by engaging critically with his ideas, especially focusing on his visions of a ‘cosmopolitan state’ and of law conceptualized as ‘tradition’. To this end, the collection brings together an international group of leading scholars in comparative law, legal philosophy, legal sociology, and legal history. This introductory chapter situates Glenn’s work within the context of his trajectory as a scholar of comparative law and reflects critically, in particular, on Glenn’s concept of ‘tradition’.