My current research is concerned with modelling morphosyntactic register variation in a constraint-based grammatical architecture. I also work on anaphoric dependencies and agreement systems. I specifically focus on the cross- and intra-linguistic variation that exists in Germanic and Romance languages. One of the overarching goals of my research is to uncover how different subsystems that constitute human languages are instantiated in different languages, how they come to have the properties they have and why they differ from one another in certain respects but not in others.