Dr. Ian Foster is Associate Division Director and Senior Scientist in the Mathematics and Computer Science Division of Argonne National Laboratory, and Professor of Computer Science at the University of Chicago. An internationally recognized researcher and leader in the area of Grid computing, he holds a doctorate in computer science from Imperial College, London, and has published five books and over 200 articles and technical reports in parallel computing, distributed systems, and advanced applications. Poster is a Fellow of the American Association for the Advancement of Science and of the British Computer Society, which recognized his work on the Strand parallel programming language with its 1989 award for technical innovation. Dr. Carl Kesselman is Director of the Center for Grid Technologies at the University of Southern California's Information Sciences Institute and an Information Sciences Institute Fellow. He is also a Research Associate Professor of Computer Science at the University of Southern California. He received his Ph.D. in Computer Science from the University of California at Los Angeles and is a Fellow of the British Computer Society. Kesselman's research interests lie in ail aspects of Grid computing and his research contributions in this area are internationally recognized. He has published over 100 articles and papers in the area of high-performance and distributed computing. Foster and Kesselman have worked together since the late 1980s, collaborating first on projects in parallel computing and more recently within the context of the Globus Alliance(r), which they established with their colleague Steven Tuecke in 1996. One significant product of their joint work has been the Globus Toolkit(c), the open source software that has emerged as the de facto standard for Grid computing in both e-business and e-science. Their contributions have been recognized by numerous awards, including the 1997 Global Information Infrastructure Next Generation Internet award, a 2002 R&D to0 award, the 2002 R&D Editor's choice award, and the 2002 Ada Lovelace Medal from the British Computing Society.