I am very happy to announce that Double Aspect now features its first guest post. The post, which is below, is a comment by Maxime St-Hilaire on the (un)constitutionality of the appointment of Justice Robert Mainville to the Québec Court of Appeal. Prof. St-Hilaire teaches constitutional law and aboriginal law at the Faculty of Law of the Université de Sherbrooke, and is a good friend ― which does not mean that I necessarily agree with him! Readers will have noticed, I suppose, that I have not yet had anything to say on Justice Mainville’s appointment. I might do so eventually, and Prof. St-Hilaire’s post, whether or not I end up disagreeing with him, will surely contribute to my thinking.