On Monday, February 25, Professor Leslie Green attended a celebration at Queens University, Canada to mark the recent publication of the third edition of H L A Hart's The Concept of Law (OUP 2012). Professor Green joined three other legal theory experts: Professor Christine Sypnowich (Queen’s Philosophy), Professor Christopher Essert (Queen’s Law), and Hart’s last doctoral student, Professor Wil Waluchow (McMaster Philosophy) in a discussion about Hart's work and life.

Fifty years on from its original publication, HLA Hart's The Concept of Law is widely recognized as the most important work of legal philosophy published in the twentieth century, and remains the starting point for most students coming to the subject for the first time. In this third edition, Leslie Green provides a new introduction that sets the book in the context of subsequent developments in social and political philosophy, clarifying misunderstandings of Hart's project and highlighting central tensions and problems in the work.