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Ricardo Baeza-Yates received his Ph.D. in Computer Science from the University of Waterloo, Canada in 1989. In 1992 and 1996, he was elected president of the Chilean Computer Science Society. In 1993, he received the Organization of American States award for yound researcher in exact sciences. He has several papers in various journals and is a member of ACM, AMS, EATCS, IEEE, SCC and SIAM. He is currently a full professor at the Computer Science Department of the University of Chile, Santiago.
Berthier Ribeiro-Neto reveived his Ph.D. in Computer Science from the University of California, Los Angeles in 1995. He is involved with various research projects financed by Braziliam agencies; the two main projects deal with wireless information systems and video on demand. He has chaired distinguished conferences in South America and is a member of ACM, IEEE and ASIS. He is currently an associate professor at the Computer Science Department of the Federal University of Minas Gerais in Belo Horizonte, Brazil.