Sonsoles Arias-Guedón is a lawyer specialised in privat an public law since 2005. She is a full-time Professor of Law at IE University, where she teaches Constitucional law and Administrative law. Her research interests lie in the field of Constitucional law -more specifically in vertical separation of powers and unitary and federal systems. Her doctoral thesis –Las Constituciones de los Länder de la República Federal de Alemania: Contenido, garantías y posición en el ordenamiento jurídico alemán, CEPC, 2015- obtained the recognition of the Centro de Estudios Políticos y Constitucionales (CEPC, Ministerio de la Presidencia de España) in 2015, and received the Premio Nicolás Pérez-Serrano para tesis doctorales, one of the most important Awards in this matter. She has conducted research at Harvard Law School, Bucerius Law-School (Hamburg) and Ludwig-Maximilians Universität (Munich). She also practiced Law at Garrigues´ Litigation and Arbitration Department during several years. She is a member of the Madrid Bar Association.