Professor Ríos is a former high school student from the Instituto Nacional, and Ingeniero Civil Electricista from the Universidad de Chile, Master of Applied Science in Electrical Engineering from the University of Ottawa, Canada, and Doctor of Philosophy in Electrical Engineering from the University of Ottawa, Canada. He has been at the Departament of Electrical Engineering of the Universidad Católica de Chile since August 1977. During this time he has lectured, performed research and consulting in Telecommunications, specifically on data and computer communications. His research has appeared in such journals as: IEEE Transactions on Computers, Annals of Operational Research, European Journal of Operational Research, Papers in Regional Science, Journal of the Operational Research Society, Computer Communications, RAIRO Operations Research, Operations Research Letters and Lecture Notes in Computer Science. He was Chairman of the Department in four periods (1988-1990, 1990-1992, 2000-2002 y 2002-2003). Between March and July of 2003, he was Senior Visiting Research Scientist at the School of Information Technology and Engineering (SITE) from the University of Ottawa, Canada.