International Law Observer is pleased to welcome a guest contribution by Dr Elena Katselli. Dr Elena Katselli is a lecturer at Newcastle Law School where she teaches public international law and human rights law. She holds an LLB from University of Athens and LLM and PhD from University of Durham. Elena’s research interests are public international law and human rights law in particular relating to state responsibility, enforcement and implementation. In her post Elena will focus on the issue of countermeasures and enforcement of international law which is also the topic of her recently published book titled ‘The Problem of Enforcement in International Law: Countermeasures, the Non-Injured State and the Idea of International Community’ (London & New York: Routledge, 2010).