Rajiv Ramaswami is vice president for System Architecture at Xros, a division of Nortel Networks. Rajiv has worked on optical networks for over a decade, from early research to product development, including stints at Tellabs and IBM Research. He is an IEEE Fellow and a recipient of the IEEE W.R.G. Baker and W.R. Bennett prize paper awards and an Outstanding Innovation award from IBM. Rajiv received a Ph.D. in electrical engineering and computer science from the University of California at Berkeley. Kumar N. Sivarajan is cofounder and chief technology officer at Tejas Networks, an optical networking startup in Bangalore, India. Kumar has worked on optical, wireless, ATM, and Internet networking technologies for over a decade, first at IBM Research and then at the Indian Institute of Science, Bangalore, before co-founding Tejas Networks in May 2000. He is a recipient of the IEEE W.R.G. Baker and W.R. Bennett prize paper awards. Kumar received his Ph.D. in electrical engineering from the California Institute of Technology.