Dr. Randall Sadler is a Professor of Linguistics and Director of the Illinois English as a Second Language (ESL) and Teaching English as a Second Language (TESL) Programs. where he teaches courses on technology-infused language teaching, virtual worlds and language learning the teaching of L2 reading and writing, and an introduction to Second Language Acquisition. His main research area is on the role of technology in language learning, with a particular focus on how Telecollaboration, VirtualWorlds, and Virtual Reality may be used to enhance that process. He has published in these areas in journals including the Journal of English for Academic Purposes, CALICOJournal, ReCALL, Language Learning & Technology, Computers& Education, ELT, and in numerous edited volumes.  His latest book, Virtual Worlds, Telecollaboration, and Language Learning: From Theory to Practice is published by Peter Lang.  He is also the co-owner of the EduNation Islands, which are located in the Virtual World of Second Life, where he may often be found in the guise of his avatar Randall Renoir.