The entire announcement is well worth reading. Among other things, it says:
Douglas Hay has made a unique contribution both to the legal historiography of England and its former colonies and, more broadly, to interdisciplinary socio-legal scholarship in Canada. He combines a comprehensive approach to source materials with innovative methodology and a broad understanding of law’s relationship to society. A prolific scholar, enthusiastic collaborator and generous mentor, he has influenced countless colleagues, students and professional peers in both law and history.