Professor of Computer Science at the Federal University of Minas Gerais, Brazil. His research interests include performance evaluation and modeling large scale distributed systems.He held visiting professor positions at Boston University and Polytechnic University of Catalunya, in Barcelona visiting appointments at Xerox PARC and Hewlett-Packard Research Laboratory. His research interests include performance models and tools of complex systems to analyze large scale distributed systems. Virgilio is a recipient of a Fulbright Research Scholar Award and a full member of the Brazilian Academy of Sciences. He is also member of the Advisory Board of the Brazilian Council for Scientific and Technological Development -CNPq for 2010/2011. Virgilio is an International Fellow of the Santa Fe Institute for 2008/2009. He is a member of the Editorial Board of Internet Computing, First Monday and Journal of Internet Services and Applications.