William Stallings has made a unique contribution to understanding the broad sweep of technical developments in computer networking and computer architecture. He has authored 17 titles, and counting revised editions, a total of 41 books on various aspects of these subjects. In over 20 years in the field, he has been a technical contributor, technical manager, and an executive with several high-technology firms. Currently he is an independent consultant whose clients have included computer and networking manufacturers and customers, software development firms, and leading-edge government research institutions. He is a member of the editorial board of Cryptologia, a scholarly journal devoted to all aspects of cryptology. He is a frequent lecturer and author of numerous technical papers. His books include "Data and Computer Communications, Eighth Edition" (Prentice Hall, 2007), which has become the standard in the field. Dr. Stallings holds a PhD from M.I.T. in Computer Science and a B.S. from Notre Dame in electrical engineering.