She teaches Constitutional Law, Criminal Law and Comparative Civil Liberties. Prior to joining the University of Ottawa, Prof. Mathen was a member of the Faculty of Law, University of New Brunswick. From 1994-2001, she was Counsel and, later, Director of Litigation for the Women’s Legal Education and Action Fund (LEAF) undertaking equality rights litigation before the Supreme Court of Canada and other courts. Professor Mathen’s primary area of expertise is Canadian constitutional law. She has authored works on the Charter of Rights, the division of powers, the separation of powers, constitutional litigation, comparative constitutional law and constitutional theory. A frequent blogger and tweeter, Prof. Mathen pioneered the practice of live-tweeting from the Supreme Court of Canada.