 Luis started his professional career in 1991 as Lecturer in Public International Law in the Universidad Carlos III of Madrid, and he combined teaching with academic research as a visitor in foreign universities in Europe, the US and South America.In those years (between 1991 and 2004) he focused his research on international law, with particular focus on human rights, humanitarian law, refugee and migration law and peacekeeping.Between 2004 and 2008 he worked in the Centro de Estudios Políticos y Constitucionales as Researcher where he undertook academic and policy-oriented research in the field of peace-building, post-conflict reconciliation and democratisation processes.