Ejan Mackaay (born 1943) is a Canadian emeritus professor of law and author.
at the University of Amsterdam in 1980 codirected by Arnold Heertje and Hans Franken on a thesis titled: "Economics of information and law".
Over the years, Mackaay has been involved in several organisations and institutions, including Fellow at CIRANO since 2010, director of the Centre for the Law of Business and International Trade (CDACI) (2005–2008) and director of the Public Law Research Centre (CRDP) (1999–2003), at the Université de Montréal.
In 1986, he was elected a corresponding member of the Royal Netherlands Academy of Arts and Sciences.
[6] On 13 November 2018, the Aix-Marseille University awarded him an honorary doctorate in law.