Santiago Alvarez, CCIE® No. 3621, is a technical marketing engineer for Cisco Systems® where he has worked on MPLS and QoS since 2000. Prior to Cisco, Santiago worked in software development for Lucent Technologies. He has been involved with computer networking since 1991. Santiago is a frequent speaker at Cisco Networkers Conferences and a periodic contributor to Cisco Packet Magazine. He holds a bachelor of science degree in computer science from EAFIT University in Medellin, Columbia, a master of science degree in computer science from Colorado State University, and a master of science in telecommunications from the University of Colorado at Boulder.