Ignacio J. Pérez Arriaga (Madrid, 23 June 1948) is a Spanish professor of Engineering, Economics and Regulation of the Electric Power Sector, currently at the Massachusetts Institute of Technology (MIT, United States) and the ICAI School of Engineering (Comillas Pontifical University, Spain). He is a life member of the Royal Academy of Engineering of Spain. He has been a major contributor across the spectrum of electric power systems, from system dynamic analysis, monitoring and diagnosis at the start of his academic career, to economic and regulatory analysis. Background Pérez-Arriaga was born in Madrid and went on to graduate as Electrical Engineer from the ICAI School of Engineering. He earned an M.S. and a Ph.D. in Electrical Engineering, both from the Massachusetts Institute of Technology in 1978 and 1981 respectively. After completing his Ph.D., Pérez-Arriaga became professor at the ICAI School of Engineering. In 1984 he founded the Institute for Research in Technology (IIT) at Comillas Pontifical University, being its Director until 1994. Since 2009 he rejoined the MIT (Electrical Engineering and Computer Science Department), where among other activities he teaches the graduate course “Engineering, Economics and Regulation of the Electric Power Sector”. He is also Director of Training at the Florence School of Regulation European University Institute in Florence, Italy. Beyond his role as professor, he has played an active role in the liberalization process of the electric power sector, not only in the implementation of the European Internal Market for Electricity, being one of the precursors of the Electricity Regulatory Forum (Florence) of the European Commission but also in the Latin American context (President of the Advisory Council of the Central American Electricity Market until 2005). He served as Commissioner in the Spanish Electricity Regulatory Commission (1995-2000) and later as Independent Member of the Single Electricity Market Committee of Ireland (2007-2012). Currently he is Member of the Board of Appeal of the Agency for the Coordination of Energy Regulators (ACER) in the EU, and Review Editor of the 5th Assessment Report of the Intergovernmental Panel on Climate Change (IPCC). He has also rendered consultant services for governments and regulatory authorities, international institutions, industrial associations and utilities in over 30 countries. Relevant academic contributions The research activity of Pérez-Arriaga has been focused on the analysis of electric power systems, but it has been in permanent evolution. Through different stages, his research interests have included modeling, control and stability analysis of