Dr Cristina Izquierdo-Sans is Tenured Senior Lecturer in Public International Law at the Universidad Autónoma de Madrid (UAM), Spain (1994-2005 and 2015-at now). Law Clerk at the Spanish Constitutional Court (2005-2014). Lecturer of Public International Law (UAM, 1991-94). Fields of specialization: Public International Law, Constitutional Law and European Union Law. Currently her research focuses on human rights. Other academic and professional activities: Vice Dean for International Relations, UAM; Vice Dean for Research and Economic Affairs, UAM; Director of the Department of Public Law, Faculty of Law, UAM (2017-2020).Dr Carmen Martínez-Capdevila is Tenured Senior Lecturer in International and European Union Law at the Universidad Autónoma de Madrid (Spain). She has worked as a counsellor at the Office of International Law at the Spanish Ministry of Foreign Affairs (2014-2018) and as an expert advisor of a member of the European Convention, which elaborated the Draft Treaty establishing a Constitution for Europe (2003). Her research focuses on the law of treaties and European Union law.Dr Magdalena Nogueira-Guastavino is Full Professor in Labor Law at the Universidad Autónoma de Madrid (UAM) Spain. Doctor in Law, Magna cum laude and PhD extraordinary award from the Faculty of Law of the UAM (1997), she was working at the Spanish Constitutional Court as a Law Clerk for 7 years (2000-2007). Vice President and General Secretary of the Spanish Association of Labor Law and Social Security (2004-2013). Her research focuses on Labor Law, national and international, with special interest in issues of fundamental labor rights and European Social Law.