A vital measure of the influence of a thinker on a discipline is the extent to which they transform its customs, protocols and practices in a way that makes it difficult to conceive how things were done before they appeared on the scene. Such transformations are usually simply incorporated into the discipline and presupposed by those who come after. This is why we often have a thankless relation to the most influential thinkers – because their innovations are now the way in which we are accustomed to see and do things. Definitionally then, great thinkers are often those who change the way we do things in a peculiarly thankless way. Jacques Derrida was a great thinker. He exerted a massive influence over a whole generation of people working in philosophy. His death is an unfathomable loss. In what follows I would like to thank him for what he enabled people like me to presuppose thanklessly in our practice.